Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d12a42309f99097…

MALICIOUS

PDF

99.1 KB Created: 2021-07-27 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 663d59d43be52ed95e0b5926838ce991 SHA-1: 8ea7d85510c4221e5c80f0e8a39ae92eb135ae2c SHA-256: 8d12a42309f9909747317d2f90a065d9e3fc9696d1b35c57f50954339d4166c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external URLs, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute a second-stage payload. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the payload's origin and leverage potentially vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d2777e91---1803330514.pdf In PDF document text
    • http://s-privod.ru/userfiles/file/nasijovokotavosifaxow.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862013b6143---bojopepemijed.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c999661512b---83670335235.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ftd7njlcc1dhcp6tmup5hb6i05/8160655860.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd848c5cd7e---zaxokejojawepojowoxuf.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bodofofabapevowaj.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9e6c8e3f---japubanigagemudupatanav.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o22ialg8gff561bav5t2l91i40/61786929015.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eb4dptq1lbkj1ko6qqu1nisdh4/nogetugiwagamozekexobipi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2j7ds2ti72sigc5ne7uugom4l3/tunoginonibe.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210702183056_73336063.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f52c4638---46231895741.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3th6mkht2mks812j8sc0ciqqs/46215632236.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/vupiwukiluvanibawef.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/46514638160.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/45797575626.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5cc8c8f4ba1f148aaf527aa06ea17332/75763990554.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58127125983.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/77570cadf8300fc78509999e9b258c5c/60870285072.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/vasutafabugive.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/87f7a74715a8d3cfe9b2b15d15875d35/simolegi.pdfIn PDF document text
    • http://htwy.com/upload/file/52055309602.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc33d8a467---38485667958.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210614_063648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=panterra+dirt+bike+90cc+manualPDF 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_off00011b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8F 18616 bytes
SHA-256: 625ad8c5756a5a49d63cfa1f8f2051d983fdc0f6ed36a239a6e3c3285993dd9e
font_01_sfnt_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E8 10868 bytes
SHA-256: 9d73211953db9952ab28b6b937f2fbc703d1be651d5138e20b69ecdf6aeeb37f

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