Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7945e7205e7b0f…

MALICIOUS

PDF

81.1 KB Created: 2021-08-30 14:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9aacbf6630859e5f9114a36d324920e4 SHA-1: c969d8d4f3eecc39c9277b9528ebe5cc89a60203 SHA-256: 3c7945e7205e7b0f616fd9c013e8161e9e0efecd975276a6ccde2504f8bf8d15
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=how+to+pronounce+poop+in+spanish PDF link annotation
    • https://olgunbey.com/upload/ckfinder/files/godovapizatewu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bukuj.pdfIn PDF document text
    • https://digireg.es/upload/51106630545.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/66997974703.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/nteart73qnvo7ru7tin53njl4o/96182634796.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609d2fe866fab---22765442426.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xevulagorudilut.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6e2175556dd87570c95afbf31a5c7568/89492480555.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/porezolevojikalokixoxado.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b2f017067---74748127654.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/98650293843.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/52422747736.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/57050431896.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b59481bf---91028931434.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/54109210548.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16124d56779052---barurikenenevumiwevapedem.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e13302aa---41995991973.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c765fbd806---13675731439.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gepegatatusolikukariwelaj.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f17bc384---toribanugebejokukama.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/67465243430.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/27a4e42fefde3665f0a91ead083e7e75/wegagegewusiburevaguf.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161299c210260d---73082015561.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8ae071bdd7e7afaf6c204932f87a9394/49632588577.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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 22084 bytes
SHA-256: 231c458fcb1d20a711eccee9f8fe396a35d2442f29854b77275b12a0da25a111
font_01_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10604 bytes
SHA-256: e25b166580cd3fa1ed80f380e1ba049e91756dc614ae4120804dc2abb74d7f27

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