Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9adefc998a4e4e0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 23:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3f20e307389187ee7230696321cccf9 SHA-1: f861206f830bcfa8c46f158164de053380670e2f SHA-256: a9adefc998a4e4e053e6b0be314d0b3ad8b333f864ca72c82a87281c87152d36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://52fotki.ru/ckfinder/userfiles/files/vevoradapugofilerinaja.pdf In PDF document text
    • https://sardavetri.it/userfiles/file/winokuzimezipujiwiv.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/31755131035.pdfIn PDF document text
    • http://landia-print.com/pdir/file/82627911962.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e140ed97d---41210834277.pdfIn PDF document text
    • https://peterdegendt.be/file/86173312115.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/22921962642.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/79917077454.pdfIn PDF document text
    • https://bem-sa.com/img/file/vogofatakaladomufexek.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ff2108da781e393bad4d162575db59ff/72445870805.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a145bdc2---88954307604.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q9rq87q0ep074hpk26gtkkbt1g/31770282783.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f3c9f42---25480585107.pdfIn PDF document text
    • http://hasyo.net/files/file/96082800616.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088908e77482---86152573467.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/abe3e20a153040643c22fdc2fc92cb01/19906886331.pdfIn PDF document text
    • http://canadanur.com/resimler/files/digokofolirozekige.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496a5a4543---gekaxexixezugofatugodid.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5aa45f1dfe275151bdc7980d7bb3989b/gazekeritugufudatudago.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160727985c8bf9---wawawigetolikex.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/761sr3ir8lv0nl2plq5099fuu2/47564753205.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32fe0e0589---lerolebijiramamukere.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/gobamajorakizinili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=natural+science+book+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 10920 bytes
SHA-256: 7f670dc399f6d88c87c7e337ba014d768d331282fdf5f1ea9547784ec7abdabb
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 17980 bytes
SHA-256: febf9d18e6562f1fdf92909fe84ea1f7dc3bb4cc0756f147d1c5c16a9868afd7
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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