Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c897621555bbb8…

MALICIOUS

PDF

70.0 KB Created: 2021-07-23 16:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb2e2194371ba4b01016d6a605cd4623 SHA-1: ab42867251da4df1b5289f28ffd54e5184fabeb9 SHA-256: 10c897621555bbb86d8dc94fe41a24574fa44ac4082e1b8651c56e58b07ea4db
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS uploads or disposable domains. This pattern is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://absolutelyneon.com/userfiles/file/tuzuteleleve.pdf In PDF document text
    • https://menu2uplus.com/images/file/fawukatedopomid.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210709_C9BCCB516413482E.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429b22586c---raziwexawasobawikedoko.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941877239dc---73787541688.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/62551691092.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41611637293.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f0ceug30m6kchh87f4l5nc7ojr/fijagowitotirefedepep.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbadb5135c---77298742744.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ri0lt7jav4bt53tv08oq0le8l0/kifegobobokepoju.pdfIn PDF document text
    • https://agermag.ro/mm/file/58279972558.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/27652922436.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a677e3e9---rodogefaxirewowajilulege.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983f0ea2c82---naxatomumexotamunibes.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/15306165375.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36be84a87e---4520731534.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/50193406500.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf5fd4339---12514649325.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc699b75f---21483291322.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ad153cace5d762d1f50d780aa69a8a64/dopelatewusegisa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/juximamufabozuxuzeje.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/63481832417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ascending+order+of+fractions+with+different+denominators+worksheetPDF 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_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 11036 bytes
SHA-256: 9b448bf78d2456213ff82cc6dce282263e8ce9d08cf2dfc0d99cad396552546a
font_02_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 14628 bytes
SHA-256: 7513b728deb66506253f7bdf5074e4c401179b2011d963d36c981cac0e5e65a1

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