Malicious PDF — malware analysis report

Static analysis result for SHA-256 510981e64fab238c…

MALICIOUS

PDF

81.0 KB Created: 2021-07-03 18:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9c122509c0f50d9d8b3b1fb0186652a9 SHA-1: a9c7ebd449005f1997ebda12529931e500bc9a21 SHA-256: 510981e64fab238caa694b2be7a4f2465ccfbf346762e7d4ca90f7a45d25cb5d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=pythagorean+theorem+in+physics PDF link annotation
    • https://tl-systems.hu/files/files/10491623737.pdfIn PDF document text
    • http://ridendo.cz/files/file/pifagepubufutu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/450b021e6acff67f339c0c65a0dee807/42656703560.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4b1ae5432fc4977cd139ba676a6151a3/33384248890.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/58833936079.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/93993631775.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/kavegalorojapagazi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed375625b9---sapakojufinajojawufibalo.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/10018061063.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7c82704cd2c0f10ab509f3a983870e18/44056918461.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fugololako.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e8f8202177ccd4194be409de3b7a6837/23420098469.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9fcf06a90551f2721bca1b617e847ba8/56042860958.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e2ilv7kd0kt0447lkdntprbh0n/4816365175.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/4528720727.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/80472933727.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782f3214402---wisedevufojojekel.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9bfa4eeb---gugerodupanuwejelawopo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/18478883165.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3428dc70---35051845463.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcab73237---36648569334.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c41f0e9---86122800550.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9adc3920029eb51d9a7615a02ecf3849/gizigud.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/80395862179.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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 10888 bytes
SHA-256: fd64248dd6fd50782d33f81605ee3c5e0a31a15c8ca5e5f20214aaeb208b76cf
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 18200 bytes
SHA-256: 92bd299ede02a854d65eeba79469aa8f1c785d9e821834efa8de522e3d6fff47
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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