Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3045ca0da0b75fb…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 07:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26cb999a9b57379be91b6e348a86021c SHA-1: a6561794f63dd3f987b56865a6f8f62269751c01 SHA-256: c3045ca0da0b75fb43e784e9d96182cf563e37a709af9837d596dff7c6b027e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing pages or further malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the primary attack pattern involves redirecting users through a multitude of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=dielectric+constant+less+than+1 PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/dae952350fdf6a4748e414460d005708/wetegezotiviroralo.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/98276173791.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/780e41a92ffcc11f282370052a4cd926/93569302207.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/nigatirodudipigododugut.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/19977854838.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/92476156131.pdfIn PDF document text
    • https://mattress-leader.com/media/73052674389.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/83275826686.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/67f2c2316b66d467fed0ac97055b7654/83275411747.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/gabofamabowuvomemakamep.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612186501babf---tanuvizamubuzefejol.pdfIn PDF document text
    • https://dineflon.com//files/62832967801.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/46781286179.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096da9a48129---30627343297.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/xurog.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/643cfa53c20a0ce7b810d2ca1a483816/12324160761.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/viluzapepovusibomis.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626181780.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hire7rqrpq5f55evkekocncdma/49500050935.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8607653502.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/5754289776.pdfIn PDF document text
    • http://minerva-collection.net/files/files/22193578269.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/95933073701.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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10380 bytes
SHA-256: ceb198870136a2a59f7309dc821643b71408081806781074b9d036addfe4048f
font_02_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 18188 bytes
SHA-256: c5b038144301c53482ff8852388010185acb6f269ee1449d19b076995073110b

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