Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8aa3afd990a6e…

MALICIOUS

PDF

103.3 KB Created: 2021-08-16 22:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86cfc811a161a4abee17f92ac9ef0f37 SHA-1: 9537435c65310bb3f084a467bf9e686336d355c0 SHA-256: f8b8aa3afd990a6e68f1b7f4cc715ff6c622e7ccde9fcdc60947b41338406223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=xem+phim+108+anh+h%C3%B9ng+l%C6%B0%C6%A1ng+s%C6%A1n+b%E1%BA%A1c+full PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096343c8d6bd---45027159673.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/15710373260.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/7jn6hggs0hb4s286b30sbgap4k/xaxexowemineloripel.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/busipagogeruga.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bcc921a6f---sitilakabugenezut.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/99147913429.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qn2dvnvtr845b3m9mjrbufbhq5/detafowisafenozuwutimefo.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/jaxaxut.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/69525079854.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f530077b42d---39760203380.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/48245847068.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e7386c1---xewutolizijiditirubiwupal.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e764bc485f---papuxuxatu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/63482815328.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/koruk.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7c8ef14b---lakusiz.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rorijulurexegogeduz.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070612d8339a---15683176278.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/64743905558.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/93a30092290819a2df4247201219cb10/4740483852.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bb00b9aedaa704bb3a935b26c5018e6d/90307068048.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jasulawo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 33372 bytes
SHA-256: c0497b0227b3cbf1e6a010b5565024480dfeda70a420f4e0f32f4eed2de3e49a
font_02_sfnt_off00014c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1E 11940 bytes
SHA-256: 5e485c1cd07120a4ed824839b9e4cf1eae6735ade21cbc0e3b4ad767cf2ec261
font_03_sfnt_off00016766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16766 16100 bytes
SHA-256: 09b945152ce732dfed66ff6ed177092a399abb4a5d353ebf49e324805698841e
font_04_sfnt_off00017cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAB 3552 bytes
SHA-256: 7b7e512553fb32e39196729d294e4524f4259c9b1bce3f54f5d4270f0d73e6f7

Open this report in the interactive analyzer, or submit your own file for analysis.