Malicious PDF — malware analysis report

Static analysis result for SHA-256 3698f53ad0289685…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 16:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad3bf4fe8c2bc34349d3cecd62474c47 SHA-1: e168b012b805164cf20e5c69d70b44ec82af3303 SHA-256: 3698f53ad02896853f0657e1754690f363b4117f3ca3a66cbeefe7d83f20c99d
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 sites hosting other PDFs. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f48000de59b6a649120ff60f9a164081/gugakezi.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/eh553b3p460dbag00fovvc1fh5/wazoxibu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/42398608324.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/felowomalizidisox.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/024381fd3db8ee9dfb644b4dd714ce8a/sisalewezufapevegoxuvum.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/weraj.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/10457f8c678dda4548ed58bab10fa3b8/32886188511.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeed0c21c4---laresudukudaparagezov.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ebd4b0e12390c0c8b658205b8912e8b5/vilisapubuguxo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798352dc52c---jiximoj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0b378687---5267476877.pdfIn PDF document text
    • https://maturana.cl/upload/file/zuwuvedifakuzamefuso.pdfIn PDF document text
    • https://alutat.com/data/file/dowewigibiporekusuj.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/cfc85360b8885db0659c52d496a491a5/22663677983.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cecfb41521f2b7b5500fd0cd313b821a/galenurovepufelopuza.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/tewumaloxoxegasi.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/raxisilijedujot.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/sorovuwavidafufekano.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/68e7afb783940f4f00b6240a886b9217/zorivojefogazigim.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/56406001078.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/7746255251.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9bf6d983---29908203383.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/79260191498.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4e3cc09ee975d54c3862439e4914a966/xekofidiwutosufo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zanukufobizare.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a7c0e23c---13013057575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=urbanisation+and+povertyPDF 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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 10668 bytes
SHA-256: 2838e4002d3749652196bbe5855987b9728c38d22610001b567c6966f99ce816
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 18356 bytes
SHA-256: aea6d96db3e4f33c35ae996875710bf74dde3f687d18c817f6a77a411fd11ace
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1