Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a53fae836e3ff2b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 09:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1a069d0549e460ef6ae302dc9c8d549 SHA-1: 21075b157a2e6ceb6e290a6a3f757e7eea3dedde SHA-256: 2a53fae836e3ff2b9a8d18b13c4b4da45a5cd8ebe887ce9f2cdc5b04a03857bb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various URLs, including one that uses a raw IP address, suggesting an attempt to host malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/f6964acd12d5baa3292bc9901d776958/kavimalusemogizanapagiga.pdf In PDF document text
    • http://wawabed.pl/uploads/userfiles/file/41544811454.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/ramowusakaguximodiburodoj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/65picbneh8egmm8n0go9iutj90/sejozazopom.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5849c5dfcf05911649fbc2b134c32942/48134266136.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/pakobofosijabetakuguk.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/49566205373.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/53b85ddeb178a97078b12f075130a9db/tuvil.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/94995618931.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4m730t51vrsa8a7sbcjdje80ku/vitotura.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2618ca47d128b5def0d9a3ca6163349c/49071025733.pdfIn PDF document text
    • https://x-software.cz/data/file/65774970207.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/604cef1a523eb4192e0b0fdc3e24d7c0/doboxokukobovivozu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515251e3---52923749973.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160875177738da---35403394129.pdfPDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f370c21a7---nojuxebodob.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f7d63dd4e---fadalonavanove.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/9701178099.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/57bc45e7a7701244f564652925c80884/zaxabariluj.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/takuneletotunopubetudujo.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/kojarevovijifofelasugumi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/753b4d27a1806a3e207d8f9eebb53304/sinivafokavudedutijeniman.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/78457382636.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/44771396366.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8nf0u1s74f9nij9i5pg7ttdsgb/28756882811.pdfIn PDF document text
    • https://mauspro.net/upload/files/nuzaluxiripuxirifafite.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/29404143614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=risks+and+benefits+of+artificial+intelligencePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607785f68e7ee---paxel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10928 bytes
SHA-256: cfb4a883d8a358524f6eb61ac0b1ab572d2f6994249013c74d12bf25feff36c3
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 16396 bytes
SHA-256: f830ea6b9bbb97a35f39b71b3f00d6ffef2f5cf025e5b4c07b2627ccd4594aaf
font_02_sfnt_off000143d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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