Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6091328281537f5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 21:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a363f8091d46354ae9c986e040c6efa SHA-1: 772dc5e5c83403ab167569c99bd344112e10b865 SHA-256: a6091328281537f524034903d9002f1cb3b2a7eb5fd17f3859009dde872c6b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may leverage embedded JavaScript or other PDF features to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://debseven.net/UserFiles/File/kizegudoxex.pdf In PDF document text
    • http://archinfo.ru/uploads/file/mowofasot.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dtooocafm4c1do8sg0p6d8nvo5/mokaleleki.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ac290b891---xazifagirunuxegupexegimiw.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/49196013920.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7960cc23b8---kavomufinepikakow.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b0ef32e2---2258394397.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/jumazukab.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_203802.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/faffc6f31b45940554476dd549c88949/54210168540.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2acf0c2f---kedakonowatamolib.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/mivadelizomatufuvil.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a889c943---monarususawuwaduviwozuke.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210830072154.pdfIn PDF document text
    • http://sb-78.ru/files/file/99658436975.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104770f7e654---38923299435.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c25990d3786a010eb4922f156bed214/tijitirelokuwu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/nagulegaribe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k6mp564216toudbur7f1s58khi/71212915705.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021082619424170554.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f7e878075558395dfdb5d695a446d3a8/debasufoxewivanekeruti.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/jujes.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/66688126323.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/doludazonojupumavumedixem.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a33945924---puzolajidozemiremapobodeg.pdfIn PDF document text
    • http://abwrva.com/uploads/files/926020642.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7635917e7f58185e16e08d47a0ca0d0b/26338940641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vfr800fi+service+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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16888 bytes
SHA-256: 1a3a53704e407249e9b86086a0d1770f80961922f6d1b57125ef8c5d539ce346
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 10744 bytes
SHA-256: f4149170e1987343050428e5c339c690807f99003c8ce5350a5bfacf20dde1cd
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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