Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7ad85bcf964a9f…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 15:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3658f4ba37f111a5fdab93a99de33b63 SHA-1: 9e79465c27afb659d3d9736292f3ea07cfd54794 SHA-256: bd7ad85bcf964a9f96bf59512eed3ad4ad3296ce5a606edc4b8dd6e4f285f142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the primary goal is to direct users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=interview+essay+how+to+write+an+interview+in+apa+format+example PDF link annotation
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/4279bb753fb18c6ea9fae0b05424c651/22510911041.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c204e9eb---23622246550.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/29385424875.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/p1pehlcvrtoo76qvhk7fllh6k7/68044338300.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160805a68e2b7b---17120607695.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/91724669597.pdfIn PDF document text
    • http://berbun.com/user_img/file/84794453000.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/tolonorakijosuwijozoxoxir.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/bamozibofijufuweredepef.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/73424865377.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/jiwavuxigomufuliwe.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f42a7645d---22390542608.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/momowuk.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/cmqgucd59op1rbf6meq9td9bns/fesoremukuzu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zajogeda.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d36f438f66d---tizobuneloramu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5a1f2f8778b4dd4d47a2b21b170f3801/funulabamifokugom.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a386c90fc2---natufegarowi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2r6i2u7gklb7728v5o3dnq8m71/3204774654.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/39f9c81863cff9653c3f4f2234c7eecd/nisowiwijele.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a8e4d949---finunuwejegubusilexokexep.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b5a3899c---pebajolilidafebebuw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0488bb49---92609240637.pdfIn PDF document text
    • http://scro.ru/pic/file/gisofeturagirefebozesuma.pdfIn PDF document text
    • https://lapdonline.org/file/sagarifovepubunusuzut.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16812 bytes
SHA-256: 441b72591a16ffaa8693a44b92591418e8616e1003f5613dd153d6b99bb91f4c
font_02_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 10944 bytes
SHA-256: ff3aff76ad6448ac9c67e89e481b513c1f72fc917730aa32cbb7898d7863651f

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