Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ab1f211c5949b8…

MALICIOUS

PDF

94.5 KB Created: 2021-07-23 16:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a07d6366a38e2a4f49cf622ab23c4e5 SHA-1: 2e40a1acfa86a07bf1babc99bc85c8335e634b12 SHA-256: 76ab1f211c5949b86bf29465d09d926439eab1607a8da2a46ecc6e5321294115
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports this, although no specific script was found to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60db31c218---wovepigarizemawaguz.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/gotenafajamawamek.pdf
    • http://drivingschool-brno.eu/files/vunomadir.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80f1c1cc2---7754749317.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7c9160b8---52651490858.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e70d80aaf9c31316099aa764c4004ac/jodilamokurolapavisumoloj.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/20615941193.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9c61814f---60156722847.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/r573hoq7utmshsin65vov90b59/paxepa.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a760d38a387b38b60fa18d974fb4c8d/patekebovexodojuz.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/fudazekolamovipikekofapi.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab8b550f7---83369294960.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1250a902---xezomegasosefenutiroriza.pdf
    • https://autosaloncenter.com/uploads/file/muvesedagabebubiw.pdf
    • https://belhasasecurity.com/userfiles/file/55282779313.pdf
    • http://amandamaitland.com/images/file/laxojuvama.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nqoepbv4f8d75o31aph3glusk7/mezofogizupesumixawonipov.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edbd39731f2---17375097527.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ecfb9a8f2---95119736393.pdf
    • http://younewstoday.com/task/userimages/file/putapuxefozonuz.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be31e7112---57127285134.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c970e1bc39cd46c88928c316057e048a/62751706007.pdf
    • http://superplasticizer.cn/d/files/wadujofufumajiragiju.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8d041ea1---782611716.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=robert+half+salary+guide+technology
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c8a.bin
3c9b76f28e73164a15dd74670c9dfa046641cee7a398b384492b83080db1cb00
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 11156 bytes
font_01_sfnt_off00012664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes
font_02_sfnt_off00013e76.bin
ceb5d927c3bfe8526e4187c649c543bb085344747368678479ce224048e81152
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 17444 bytes