Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea33d8ba73f0919…

MALICIOUS

PDF

100.7 KB Created: 2021-08-01 18:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da6872825d66fc6dda40f1010c573d22 SHA-1: aeb21a85936b8c90005fb20ced5096c0fdef122a SHA-256: 0ea33d8ba73f09199f68651400ec60d4eb6bb0ff5b0be1ff1ab1dd57acca9398
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, likely to obscure the true destination. The document's content, though heavily obfuscated, suggests a callback phishing lure, prompting users to call a number for fake issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/51516323939.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i720ejtk51r6uqpuoi29tcb567/kanefizebuzegevivemolebil.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54992938411.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/betuxajubovafagedojabute.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1764694105---linujatilirulivefowajor.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/sebubamavufab.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lj3tdhc4mom2not5lrp7eivl1q/kidutawivulipe.pdfIn PDF document text
    • http://goref.ru/files/file/kilifa.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/955006810.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/24558875137.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/82954716517.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732660217c---depejulasipexoniguj.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/6658705411.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/53950209008.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b9ad2b870---fivikurunegonozip.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e63e4a2a7---zilebetokegisokibiwupono.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/sebamituwalo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/41489882982.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3501f43cf5da1f9bbc26cce004d404f7/67301978981.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a4e4e0bdf2e3cb917afe0ed30f5cfc15/dofanufofip.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/9271448570.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/6946495413.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b67b3688e---2021436655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+the+power+xl+grill+air+fryer+comboPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/48334249041.pdfIn PDF document text
    • 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_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 18372 bytes
SHA-256: 9b02efe76af472964cb048146d5e7ea818a6ba7707346b867a1f4c733b093ea1
font_01_sfnt_off00014f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001676c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676C 11356 bytes
SHA-256: 6e6d7c881cd32a44f16250cb84ad3ec0ed365f0289938ff04d544ffcce473fc3