Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f6edb73505c1d4…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 16:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48b21c40077e3eb4fd4511197660ff62 SHA-1: d29dfcb9a075acd508c662a09f5a2f25d5bb871b SHA-256: 77f6edb73505c1d4d1f0e60e3010b5b39fc173a453d0b000d9abbbfac8228608
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://wastran.ru/uplcv?utm_term=mobile+tracker+for+android+download PDF link annotation
    • http://abwcolley.com/uploads/files/10288097046.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/8530163447.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/bulexarowimikepe.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/46598761885.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/rewibiwarijefinel.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/060902586299.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/63949615235.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161302a4d62e09---puvudebisadu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/guzuwozivufazomujutenumo.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/99069638485.pdfIn PDF document text
    • https://beaszemin.com/files/52119834829.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/gizufasemobuwaxoj.pdfIn PDF document text
    • http://hla.vn/upload/files/begegewasobijibekotixama.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9901348a1b693b4f5464c3726740858b/20822261361.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/30703983531.pdfIn PDF document text
    • http://nscenter.cn/upload/files/57819223192.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137936b7c171---vorojilobizovapesab.pdfIn PDF document text
    • http://allasclub.com/campannas/file/57567730375.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ef44a4247---febexux.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/2616255476.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xemopedasaz.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/puzijetin.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 19096 bytes
SHA-256: d07ce4a92aedbfcc5add4c90e89facbbdc91a213ce18237d104a976b0df7cb7e
font_01_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 10612 bytes
SHA-256: 5599f674b0e7eb61bdd16b45aadfaae9ee0c983ecf3ce7662e33ed03f31cbde6

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