Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9ab9851255e6eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 00:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a629b1e70f8828a84c264861ece7f52 SHA-1: 2eeeef1918f857955d6e16d03888554a84b19208 SHA-256: 7e9ab9851255e6eb2f195aecadcabae503576b9c4c05bb8f1502de1ce530ebbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=vocabulary+in+use+advanced+pdf PDF link annotation
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/93038520447.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/waderezobiwutelenopa.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/toriw.pdfIn PDF document text
    • http://pronobile.com/catalog/file/xuxigejekivabu.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/jobidajusajudisuleweza.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/nigupo.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xefemusuwogutotiwemijat.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/1322250534.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9c1d4193---93489700617.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xegikesegujirawut.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9b95acdf---53322928778.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xedexirijafedo.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/wavojotagonexiveke.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/897064123d9458908f565dcfd92dd7a8/kakimupediguk.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/pinulixenotapexe.pdfIn PDF document text
    • https://umutfm.com/resimler/files/55182009554.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d806d240---467855726.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/wewirifupozojonunanilemi.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/zakitekiv.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/modanawetalabekixijadeg.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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 18560 bytes
SHA-256: 9f05ddcb5cb52166d64b4b69419a92d8680abba58f16cb4b84f0ee6c48a297d1
font_02_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10904 bytes
SHA-256: 84920eac5666697446182e306ed356eaf9cbe2195d55b91408455be44c4f9fe3

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