Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd5f75c8a063d13…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 10:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c828eea706ece1e8c250bb40f32aefe SHA-1: a81658eb5188350e596efde8ec51efc485ba122f SHA-256: afd5f75c8a063d13b0c8ae3d1598f49d2392d82ebc8a432b2db928836a7c1707
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 ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the numerous external URLs indicate a clear intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=star+means+in+interview PDF link annotation
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/a5t84a2vgiqv77k270n1gaj4e3/30837912727.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a28a2b6b5c677ff76eee781f2c8e79ce/98363304854.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081769599474---namulobutokejijovekodej.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4adea0bc174fea46deb23cea9070345c/wakusabuxubonas.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/59704671757.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/24473237250.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/80984237400.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b661c83c653a2b1fd17fda57350edd91/bibukuxasofuzew.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d26f87b35f161cfb6cf264bdd28af5e1/gabenax.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/97193393067.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iot1f7dq47qrit5c6c0l4bqaeb/makeragumaxoriwebad.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785b587fe43---goroj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4295f9d1bc---nuxowakajerazi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/35751956341.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xugatarizasiguzetiz.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/miludegimuvemeka.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/pulez.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69f42817b---66295785049.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sigujevudadepatisijur.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/prksh41v9v6hkh1hrvenc9lgf6/modopebomo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/h8c44kv8sfbdp1pnmmeq3uqbmk/70593867423.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0928278ff7---36379764245.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2758aff73964d85628ac88ecbcb6bc90/nulisorerixevesalosa.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/jitenibovivudonodomog.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_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 18632 bytes
SHA-256: 158e3488edbf6bdbe4b1c64db4e117acf2e5a436f35e45508ffc9cbc34c55e14
font_01_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 10328 bytes
SHA-256: 81bff8fef00196482f08de6345045965a0730bf8afea110c9a40e0a824c8485c

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