Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e3e660cf8f6424…

MALICIOUS

PDF

96.8 KB Created: 2021-08-14 14:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b90b16be52b477a36a82200ce8cfd67f SHA-1: f10be0e00655a05c9f7afdf164ac32797e5e7945 SHA-256: 53e3e660cf8f6424f2e79d97a1832f693000b757bcd0cdb4f7a4df11eb4e18cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://aplusadvance.com/naver_editor/data/file/99515136182.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f5bc3a00ffc999a25c011f24c1988d79/92113404688.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/taronuxabinezokuj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11779182687.pdfIn PDF document text
    • http://yuha.be/_files/file/97997399085.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082901f31b8e---70078706230.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tupifegojevafo.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/62784810100.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/67585341281.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/rofazizasazawefupam.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rupapemudekobujano.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1b3ba136f8fe8712120dc6afe62d0a21/pigibupizuvekodojezipu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/d8qc1v3jteap3ug36ice6mtd46/girivuju.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5e2684b3be9eb532ffce5fd3006f2434/ninifavimudu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51d0f966ab---dobegazeximalu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xedumit.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/38620378998.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/86756736681.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/jugefowaxejij.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qa89g9cltiahrrs5s9ftme74s8/zonoriw.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/43156552168.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4d4f0692---32320379982.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/bomapetu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/40632412011.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/legeruneriniperav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=que+es+la+enfermedad+de+la+gota+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00015602.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15602 18216 bytes
SHA-256: 03b967f3d750c7847d5793ba808c84bf62fa97bbd08d1969b798edf7c6f0a117
font_00_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 18180 bytes
SHA-256: f1717854f83945ebd990e146e96ab57f8e75cdb32c13e1505f8c2a55e85ad5fb
font_01_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 10908 bytes
SHA-256: 6b2242bce6a4ab33c40c690ef8313f120ef2df81a65ade606c7782e0a85c82f2

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