Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea4f347f606845…

MALICIOUS

PDF

85.0 KB Created: 2021-07-03 16:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1788df357f34cb0aad568d5d40fc7d7 SHA-1: c2146fb2eb4872fb17d5b8335a68c9d49fa336b9 SHA-256: 99ea4f347f606845b9b936ff9d269b280ee5b053e9701158df3d7e68c223bf5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to PDF files hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious content delivery or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://afayl.com/userfiles/file/zekavize.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2cf92f713fe87bc16d71d8618cc8c752/14540591559.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe419aa618---25902388523.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9a5b7086---jukezumisopip.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jukenemat.pdfIn PDF document text
    • http://dges.in/userfiles/file/fumodexamuwepi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0ff485f01471c437a7c9ba07762a086d/laxax.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sezedewilo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/719812145b0353b9395d5b3b004527d7/waxikereno.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45262490522.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u1tjgcbn91dvkl3ec8pooln2a8/bipomumimopipabumiseto.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/kewasejepejadifokosixeb.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/lemojeravenuxiju.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/6893474210.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e7df06e4---93531745385.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9acae6f532---34148592717.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fubedexobasemo.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/metadodotegawemapinil.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/e070s310u473gu1co07tseca50/merunolifudez.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/49bk49vfhihijbfi02uqr7337n/vonamelemoxabevovupake.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/bofuvidewibanomul.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dujovokadotubijavosorotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=adhd+meaning+disorderPDF 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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16436 bytes
SHA-256: f665e21faf94fddc25cc7db6a66fd553a3a62df0844222dfc105e390fc6a06c0
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 10532 bytes
SHA-256: 9304944342fe2ef2e6d2c394a41c624d1b7540b842fd4431b6239dd4e76c3b06

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