Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16930af46f97795…

MALICIOUS

PDF

151.6 KB Created: 2021-08-04 03:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42081008a4f8e51658c8f2e58dde0226 SHA-1: 35f8b3df865bf2761bf341da20fc5448e2b22ab5 SHA-256: a16930af46f97795dd2dc217c3038f904d05a3fa9b07946d61b60fcd4aceecc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm, with multiple distinct hosts, further supports its use in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e67be0eb---70553306107.pdf In PDF document text
    • https://accounting789.com/ThImg/file/665982064.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/xiruturifanakudew.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0ec9d23181354e39f2c20b1ab99539da/93962415810.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c55fdc61b---53162700839.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a657308d6---72018202723.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/hcr4p776rh59moi1rgtlr1mop0/38188928557.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/57409154456.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/poe4kl7s1q5qstst701jm8vpp2/petavipadobuja.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/93114601568.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/tafubu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3a53886da6dcde0ef291c3ec6d19c415/16511894870.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/deguj.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31f341b49---30049957203.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/28163772827.pdfIn PDF document text
    • https://eguiders.com/uploads/defiliwon.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezuxip.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/kubokuzidotik.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/76823758055.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c51e470d78672c1dda5b7cade4007ba0/xepadakikafisigitilad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8bf79426d0knmjmqao1gasngqr/26139339133.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/43594858051.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65330733215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ch21+kieso+intermediate+accounting+solution+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e15f2f68cffbbbf60327f8fa825fa213/mitewu.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_off0001ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC50 11212 bytes
SHA-256: 9f32e132bdf3d4364dca2e653fcc8bf2ad2f66a9bb53ce1676de3909425dbdf4
font_01_sfnt_off0002064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E5C 17956 bytes
SHA-256: ebdfffc6263c9930b4e5f5929b2ce57295d5a73fa677d39dbdf69ffad692ef53

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