Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cbae85ace092cb…

MALICIOUS

PDF

111.4 KB Created: 2021-07-27 16:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a41f492346981305f61e4cd03eb3e7a SHA-1: f84a21c84913f64d0245e7f8cfd764c9b8984086 SHA-256: 97cbae85ace092cb53dc7a99fddfe0a645631ce64224ac7faff269b67077f756
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 or are hosted on disposable domains, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://studioingtassinari.eu/userfiles/files/gigugamelameti.pdf In PDF document text
    • http://footstepfloor.com/upfiles/files/33903346860.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd58eb594---46838084370.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/54061821173.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021791053137564.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/venuturifowu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mia92bdv6fbodth1ug3aljbspq/gozelumaga.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9894ac5e119556f9e4a058bfd1bb409a/41635704816.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca0eb635d---xawiwazafumasavudiz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16403038678.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/54106517495.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3889714b---temawop.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zitiletodaso.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5c0khlcm1vblq8tc16dl0dasr5/nurivitukubivizosesamu.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/i1cirnb1e65gl00v3ncfa05mc0/31730996614.pdfIn PDF document text
    • http://meskerjager.nl/media/files/zuzadudufu.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/32753477573.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/457d34d9761ed3a8240f98d630f3790a/48204904169.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/getepu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/55250321799.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/23563483293.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b02e85fc---71489282930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mipc+camera+keeps+going+offlinePDF 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_off00014f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001677d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677D 18068 bytes
SHA-256: c7965b015854c5eac6a96f33e291ffd798c3515e433355eeae931ef6185ee4c6
font_02_sfnt_off00019691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19691 10808 bytes
SHA-256: a7a9c009fe99b5b24046b3ccdabbd13daf49f1ad4be2e28edbe78dfd87a7a68a

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