Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c4705376e711d2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 22:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2620ab6ddde4489989890686ab1db3cb SHA-1: adf7a8c4f7c71e26d1ad96fb7b9f6d3e7f4e5e69 SHA-256: 86c4705376e711d2ba5a4bae80b18cde90b8a57b67800138a4395a4211fd0c22
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDFs hosted on potentially compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=sheets+app+android PDF link annotation
    • https://isuzuphonoi.com/data/dulieu/files/16984214689.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/94072861484.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/gefamilo.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210917132117.pdfIn PDF document text
    • http://platcometals.com/images/file/8553138710.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109070648114857.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/33966364150.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/75903521630.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1j22g70a8r4sfqvhdi9upcq1d4/96660047282.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/gomow.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/lajemupopigetefeto.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ecd69dc4fd96dccc13481371d9eed1e6/sawamutoveragirowawova.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/73003810586.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ce98e2babdc848551c0936da5765497e/kuweleta.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/soralemope.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/60823318937.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/zikuzu.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/50108134993.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/pimuvagosoruwo.pdfIn PDF document text
    • https://photojet.net/userfiles/file/pezoxoxozomepabige.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/18766810822.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/wivufidagam.pdfPDF link annotation
    • https://gtnet-engine.com/ckfinder/userfiles/files/zesikiw.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/siwedusunax.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/kodifo.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/tamogedegolanavopitila.pdfIn PDF document text
    • 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17180 bytes
SHA-256: c92326bca226426f874e684e7721a015b1cb2ab17830cb1b00b91b1a0edcae72
font_01_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10520 bytes
SHA-256: 1e047d96b539014198f91a5f8bf358ebda58b851d1fe52d53b1a4dbd331ebda1
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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