Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0fa3e71cc1bcae…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 20:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 389dd6e266a12d6c63f4cd8b4301b61b SHA-1: 49976e4624b4956accb0ca1d58d7a7b7a8c563b5 SHA-256: 8d0fa3e71cc1bcaee40e0213cd092cfa94ae4bd772bb39ad39580caf86bd6811
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with heuristics indicating it's a link farm hosted on compromised WordPress uploads and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=call+recorder+stopped+working PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a90c5d142---36953871567.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/vorububovowoma.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nidufu.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97379279237.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/87217829869.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908171735.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161397da28fe92---riguzulasutunumid.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/95810273536.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/meneb.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/lofugepulubosax.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903154719763164.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/muzoxevemotipofirawuf.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jatoloromixedi.pdfIn PDF document text
    • http://salt17.com/userfiles/files/26095455765.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/53520544373.pdfIn PDF document text
    • http://newshop.jp/archive/file/40072782421.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/92476709313.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/jibavokudigezenenim.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/67699024846.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/54903814579.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/96594161242.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/4099087979.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0db2a3c8c1f21acb93df6653e5992cc3/43873711429.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/noduk.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/laserumaferajexifizelesob.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03d73d5a5---39052200885.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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 10900 bytes
SHA-256: 256a60dd6ab55e606c82cc6c01ad303b25e8929275e646e2caad4279c0dd4514
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 16804 bytes
SHA-256: e1b96a0a087166f7543228b09d18dfdcea946c591f549abd5099c08894fe6a8a
font_02_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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