Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19182d543cbd5ef…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 08:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: afc0cbb59e142fe1fc62caa11363b3ac SHA-1: a2cf431d4fe7616ce50e37657ca69083b6769759 SHA-256: c19182d543cbd5efcad32011b2a83561315df2268080af7b2d2f26c92719595e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech support scams and callback phishing. While no scripts were explicitly extracted, the presence of multiple external links suggests a potential for further payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=dragon+ball+z+burst+limit+apk PDF link annotation
    • http://studioscoponi.eu/userfiles/files/19985171916.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/67864983840.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/20335548202.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/45393296455.pdfIn PDF document text
    • http://land89.com/ckupload/files/81266281430.pdfIn PDF document text
    • http://senesi-sklad.cz/userfiles/file/98561847498.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gizeraxomivufuwulol.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zakoli.pdfIn PDF document text
    • http://sdes.in/uploads/23164357866.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020035133361.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/vupiri.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aaaa6bf09---mefomelakumuwazu.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/47567533577.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/50222043215.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344e59a8611---gasasabasit.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/66898571020.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9020elf3e0qni0k9o86plqelos/zinisun.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/38954967531.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/82805797432.pdfIn PDF document text
    • http://sinoorchids.com/image/file/zajiko.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_off0000b792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB792 19004 bytes
SHA-256: 2ffc32099e309b161efb8dc46b12179a7069096a794c93b8314de3238c1f7964
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10856 bytes
SHA-256: b9c32531ee4183df4ffb4f8e72c35a46ede246fec9f3619b5cddb782524555d9
font_02_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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