Malicious PDF — malware analysis report

Static analysis result for SHA-256 af938a5dfcdba17e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 14:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f6089f3a823f449ddaa2d4b491960af SHA-1: 7ad00a8acf6b40fa24eff0968f8fbb2bba7e3478 SHA-256: af938a5dfcdba17ea0227d56ca939f55991f097e130a0f8b4addd132f3880703
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a credential harvesting lure, specifically requesting MFA confirmation or one-time codes. The document contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://alrehabourhome.com/userfiles/files/mozojaguravabuliveb.pdf In PDF document text
    • https://tekartltd.com/upload/files/bimoremivigeva.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xugimo.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/94150901991.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e501383e97---56910066630.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sefubiwokiru.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/fivuw.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/7408923307.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/11471420402.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109050751505682.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fogonotarapaxujegiduku.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/88592151343.pdfIn PDF document text
    • https://estoniapools.com/contents/files/puluzefatazugajutenofel.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f0bd5665---xoziso.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jurobevonekageromegakazoz.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o2pc1bnahkdt99dp2vj332dr92/jobutozisoduwenomipi.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/7245304286.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/pasetonejudexuzebemixufa.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/viseseluj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ff9c465---37412875312.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3ad5513aa---39815116383.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/32711229018.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/tuwavupubugamexagutatanib.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jafog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vlc+android+transfer+files+wifiPDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 17288 bytes
SHA-256: a9f34e18cee2aa43d07764f34e0f8d34d6f27e9b277b2593bb218d0e59deefde
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 10524 bytes
SHA-256: 949c72436f864495447a96054936854573fe3d865a8f88c9e23e47fbd961148b
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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