Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c047d3acaae0993…

MALICIOUS

PDF

71.7 KB Created: 2021-06-22 13:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0cdb26d042703ea684bb500752faeecf SHA-1: e8d78af389d4ca35a352b07ebad133f2fc3f265a SHA-256: 2c047d3acaae0993e9af2fe110f459023ef371ca43706042bd2dd3e5a5d7289c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious link distribution scheme. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hodinovysoused.cz/upload/file/sasoxekiravomuzovaj.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/21137032858.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d5b2b87fddf898875bf727d85edf25b3/sowapogilod.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/11685988679.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gefapavev.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4c217099405b2b07422145cba188908e/19334310629.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/87e437146d6604d57e3391b350528905/davudimajetajuwukikovuro.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/83787948484.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cce18b77c83---pulukinewovobapazizexe.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zeponij.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c1f3e4a4eeeee19c1b5faaa315ee1615/togikotibamununozaxadime.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/jadazugijedatogadumogor.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ej1m79jrmjfacil2mqnd8m9a4n/woradesifeg.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tawam.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210619_E80ADBDEC3FF3B10.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160931ce82d8e5---tofukerujebozarapute.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dl2vsffcrkl50d8f7h8p4qudq2/54611612849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=rank+booster+for+mlPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5124 bytes
SHA-256: 415bac3bf762f7997561aa95bd4471be4974731e650d5baf3ba1fd4754b67944
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 10448 bytes
SHA-256: e8c691046f98d6dee7892db511a2bbeef57122ba5ef66e98cb04c84554ea6a33