Malicious PDF — malware analysis report

Static analysis result for SHA-256 8099810348a11488…

MALICIOUS

PDF

94.9 KB Created: 2021-07-17 23:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7a5b75b36ff2b1dcd8e36131504da3e SHA-1: 615513bdf42f474a913258781db7add952e27195 SHA-256: 8099810348a114882eaa21dfdec462ebf5a1a352d84c7014c92fc796827f180c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PRC/3D content heuristic further indicates a potential for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • PRC/3D content in PDF high CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607937d999e47---befodimunexo.pdf In PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/38189580630.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81baf853e8de1584b2f80086d46f97bd/26050636061.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/zenorowobuvowibeg.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/pavodukowirudodufivutiv.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/bamotovuwudibolepugi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d110a67258---44309852315.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tazapo.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/2fa2e5c43addd694ff4417525648e3e6/77307066671.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/kuxegemevogukabasujoj.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2b6242faf8315fc1f4d0aac6e9aaf19f/giwelofiguwexizin.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/mazov.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3902778ac26636b97c93b1c2ee327600/demeduwevivup.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9b1337fdad521b1939b3a84bcb6779cf/wodozivite.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e701f0030e---tivetizonelezaxitami.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/84965295656.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/48171396034.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/gevabifajun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac906c751f3---3494096189.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6703afb64---87384602387.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/67736440993.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/zakapizumitabupamivejajun.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lomolum.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/81290812437.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zobiviserulate.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0s0ulaup3dum587bbcefcooqs0/94141562470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=patron%27s+day+meaningPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 17180 bytes
SHA-256: 42bc4d5620c5618d9b06424aa10de3ab423e0c928ceb0e5eb78f8bbde14a337c
font_02_sfnt_off000154ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AE 10696 bytes
SHA-256: 0449e2e4d3786e7a65ca9c71f421603d3dec4d9e024507495b4550e84fd9c699

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