Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f1d3cb690d490c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2753360a01ffecc1a7119fb374a26f5 SHA-1: d94b597d856262ddb97ca1b5d95ae243ceec726e SHA-256: 62f1d3cb690d490c6eebcc904b3b61ad35d4afd1039c31a49b5d06a6d22ba739
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish users. The 'SE_INVOICE_LURE' heuristic indicates a social engineering tactic involving fake invoices or payment requests.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://alpha-th.com/userfiles/file/49539792577.pdf In PDF document text
    • https://olterus.org/contents/files/59983646863.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348762a7622---23833410014.pdfIn PDF document text
    • https://cooperspick.com/files/lizujelamuli.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/lamub.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/37489127398.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/78542218743.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/24266993851.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/netemofujobujavidama.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/gurevi.pdfIn PDF document text
    • https://norservis.com/files/files/zarodepixap.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/jumudi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/2409976459.pdfIn PDF document text
    • https://huanghecables.com/d/files/75595944844.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/sozilonegipuvijigapolo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/difugudinepulumariwax.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e70e3640---lujesujobimusetawav.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6200196c845befc0531ca94fbe073ed6/87496323720.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/96208820008.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/60786525613.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/37974270200.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/bifujupasofadulesezedim.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631179905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cash+now+apk+downloadPDF 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 18116 bytes
SHA-256: 70c9f8e2ab85c4518f707071b35f1e66c5def2437275f374ae9e40f6fb8cc17d
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 10276 bytes
SHA-256: 80c53dad28f9a0ec116d21f791df5b8c0357672eb7eccf6d9366682a27b32668

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