Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b4788e66132b36…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eea6b5e923c2f018d99e338ad4fbc046 SHA-1: ea2349466cc3e43fcd3f803d2febcc5cd586af49 SHA-256: 27b4788e66132b3679ae02ffaeb941d7b83e1a27faafc75ae59f76151d1892e2
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cremyco.com/app/webroot/docs/file/bogujega.pdf
    • http://centralcogtc.com/uploads/file/kukavimifagorezi.pdf
    • http://bbfederico2.net/userfiles/file/wuxatesewelasozepu.pdf
    • http://anandamsanyal.com/userfiles/file/xakexaxifij.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a7fd96921df0e28ed10ca14d2a865d85/jejujuxo.pdf
    • http://birnagarcollege.in/userfiles/file/woxob.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c159dcac407---fasawigifoliduvem.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076cffacd434---sigesawagojuxul.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160853cae86777---99410393101.pdf
    • http://akinmedical.com/uploads/file/zadanopuxemorulonipo.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4snt625m0213ogv1osncssn9t5/vonusekezimubefutiso.pdf
    • http://cuatro-pr.org/sites/default/files/file/42605509769.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8efa359d8---89730820623.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b7cc874f---44518772975.pdf
    • http://www.gesas.it/media/mailinglist/file/81657373755.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33265dc919---sisukejutewewoxewasav.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2a8abe64---5128719491.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad506bbce2f---71893972491.pdf
    • https://arzhosting.com/calisma2/files/uploads/94191198289.pdf
    • https://mvservice.it/file/rarekuvaxusifadarogabin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=march+madness+fillable+brackets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
font_01_sfnt_off0001036d.bin
ce065eaa0acd3b7dcf68862e043bc46cacb68e8d4837b96107db7de0b6a9bad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 10848 bytes
font_02_sfnt_off00011c41.bin
77db95576cd12fec7d26577c9de4929c9d32356f37839e4e47cbd247813bad02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 18448 bytes