Malicious PDF — malware analysis report

Static analysis result for SHA-256 3481e5bce624349b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 01:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 634290b1a1553a7487b6c2aad340443a SHA-1: 5be7c58262995831fe0d187b70d2287c88d1b307 SHA-256: 3481e5bce624349bbd3b3f6ad90decd25e986358894b27d4761f5c75a50e1c69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic firings indicate that the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/07e58f3ee025a676d7326382fded8187/4331070691.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073539f6ce79---93283616770.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/15239985.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/34752982384.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ufne01f08137hbiubo5sf7u8f3/zerirebiva.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622839561.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/38176672402.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086943df01fc---zenitelutonobudedu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/rogil.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3tkesfhfins782ee97826o760q/febufo.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jelujoperufenumira.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d033577f---rafuwikipuwodorilibokifi.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/powomenufem.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/kojuzelelelopo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sekokimeli.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/40235673527.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b077e068---ronozupubusetekutusa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/de042b832d606621f3f9863620ef6212/rupegezu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/12274828920.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/65123525fd7ca623c4bf23c6c8d14b2e/24204860625.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/vifurekemenegekidutozom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=most+famous+landforms+in+the+worldPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10800 bytes
SHA-256: 30fa1225d5d719d8b928de4d4badb241b7ebfd993df51a7515ae4bbb1f6b0971
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 17404 bytes
SHA-256: 345d2cd94b4038e47ce3292555cff1165cb2dcbbb4368e8677169ae4311e82e7

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