Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde7bce57ebecba…

MALICIOUS

PDF

95.0 KB Created: 2021-09-12 20:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88272f38c1cabb68b3e50f9e8f488977 SHA-1: 739bd6558803f4977bab0c4037041d64bd685db4 SHA-256: 1fde7bce57ebecbae0192e52ae7bde90f92529545fbe596822ce831c6069e98b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number in a context of billing, refund, or security issues. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or initiate fraudulent interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • 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://clairerolo.com/userfiles/file/pipil.pdf In PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/gufulisuzozivutenuvi.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/79469811333.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/64375164807.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gizesifemuzewagoposovige.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacfd87489---10738345792.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wopelugaxudexivitoz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613950ac7ff4d---nalulasanobinur.pdfIn PDF document text
    • https://gulamanis.com/contents/files/zarodugugogob.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/14633291823.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/lupujejoporofalarijesawo.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/nobevaluxexage.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/vevuwifilafawoponisuxuz.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/bebejewunomomep.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd08670fae---89846861026.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/sujesokutojuwon.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/61940575061.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10597449257.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/767eda28071a1f766a8b397cd829488c/46826918977.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e5db3ab---nerog.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/27697350373.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/fosesatogoroxufinosu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0921aba66---tadenunuduxifubejelag.pdfIn PDF document text
    • http://annabarons.lv/files/files/3061092510.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/39560271211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=new+world+order+by+ralph+epperson+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 22596 bytes
SHA-256: f846fa73b90075662c7af8fd8f1fb78b80b016bc928b6169c8a276e811d534b7
font_01_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off00015343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 10720 bytes
SHA-256: a04397403ebf678a17959ffb8567def0c9753f4fe4a496c539e4edb008179dab