Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab67ff4e5e727a54…

MALICIOUS

PDF

79.1 KB Created: 2021-08-01 20:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 661d63d35fd20154af99f11b88e188cd SHA-1: a0c21b1df02c092fdb8644b263956e7013705ba3 SHA-256: ab67ff4e5e727a548d9049202c059a2a9291192654833c7c2be99402e8059bcc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, prompting users to call a phone number for issues related to billing or security. The document contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to distribute malicious content or redirect users. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ptogel2.com/contents//files/minojizalitid.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e34821e3901f91d875216741fc88fc4b/3251950623.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/birufatuv.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089420c401fb---71282081587.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/deparebogededuwumaxof.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/fawar.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/remegamabageluzitabafobij.pdfIn PDF document text
    • http://axwelindia.com/uploads/59972210759.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/80595678586.pdfIn PDF document text
    • http://ty-int.com/files/files/30373429358.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ae3c0608a9597f05290986d177654c83/72005153347.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/tulefuwanewa.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c275c0c1cc---40548084117.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/27998514621.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210502092020.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/052b6b3ac68ca0c6e6a6b37512edadc4/jigexabiwijisopafodepij.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8f1b2802bd970fd33605a05413aafa60/guwuzidegimomexi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccd60f640---11707658916.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc2803727---duwibazumados.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcfad51127---gomofinesinokes.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916d5ca219---kifusu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/wuluperemibisofogarax.pdfIn PDF document text
    • https://totounited.com/contents//files/24417971397.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7r80uanp4jmpjtqp8u105t2ba0/lurexusegasumelokuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idaho+warrant+searchPDF 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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 10368 bytes
SHA-256: 9cea50c5e5d21b058a18a41458e0e2f10218d0d27a2cfa929f1ba6de52701358
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 17348 bytes
SHA-256: 5a4f68b34cb2fde45c2d341330846b06fc57e98e6d99ecf003322a97b983a6d6
font_02_sfnt_off000116e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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