Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c682e96fb01ea6…

MALICIOUS

PDF

87.4 KB Created: 2021-07-23 22:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba5d1afbc56899ebbb2ee50e34d68296 SHA-1: 9f0f01141a670b7ccf61f0e02037c53909655ead SHA-256: 38c682e96fb01ea6ca68af506e8cce923aee18152edbefb2105cc522913ae081
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5584dd4535500f788708d4c5ffe11cfa/18557950862.pdf In PDF document text
    • http://coeb.eu/userfiles/files/subowofe.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/1158547266.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6e624229---64074817126.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608289aaee983---vigebesox.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0b7kbgpm3mns2r0km9n17gbnc5/tukurarufekavapovijilo.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/jazetusuvapozapukubarexe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8d46db06b4c440474385a057454668ed/kaxabesawubopokunagerib.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b36840ad6aa---jifezawuw.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/80326991926.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/88851860354.pdfIn PDF document text
    • http://axwelindia.com/uploads/vowasera.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/56660317576.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/61364753219.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/14346034343.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/jezagudumojorileredefulut.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/miwufedofexud.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e45d2a3f---97021006505.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54545df59---6563869251.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/dozigi.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/gipusivunoniduwowi.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/bavajuded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=classifying+triangles+activity+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17076 bytes
SHA-256: 5d173f911458fc2a14a0cd62268eb33a67d5b85c0fb8155d2fc777fa62e6f999
font_01_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 10888 bytes
SHA-256: 1b3f7a49d1a1bb65d32ce33a637208981a36406c804947347c23032f1d66bc07
font_02_sfnt_off00013517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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