Malicious PDF — malware analysis report

Static analysis result for SHA-256 426e95e2103c0918…

MALICIOUS

PDF

83.2 KB Created: 2021-06-24 13:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfe2c2461fa63a28e6ec2a3ded2530f4 SHA-1: 6fd1fe04a6c16463e17188d21f95ee59798543d6 SHA-256: 426e95e2103c09182aae6714eaa2d3b8ac49064d5f0735ae10665f4fe6be792b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6a3ea05917fa2240e38333ab4d814c23/zidolaxi.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9787ec4807e7a6fd31d30684fb91/24646862545.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b25fddb0e46---wuvowatewifuxefi.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a035131bae1---89445379628.pdf
    • http://allnatureint.com/userfiles/file/82532071178.pdf
    • http://canadanur.com/resimler/files/sageberazanepikage.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/1d6d8ff8aa2a6020e5920b0056475294/pesasisileralorotawodave.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/52cad15e6d832605648b172b85b0e173/zuwedero.pdf
    • http://sushiloverca.com/uploads/files/59277335592.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hntiq8i9ilcon5o2ukmojq0pa3/19931137832.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7e5dcbc32---siwabusojuzigogojawereb.pdf
    • https://pypconsultores.mx/userfiles/file/menedevemebupobitem.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d83967ce6---36225004984.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f12417741---bemagexip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=throne+of+glass+3+read+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f947.bin
21ea26b1a1b1683e7ac0ce8d44f219d3c14ea9d81d935def84dfff73405f26ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 4992 bytes
font_01_sfnt_off00010a28.bin
b39529f3167dc42ec932a75395c211951c28a916fda5c651adf0686aca5f6dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 11024 bytes
font_02_sfnt_off00012fd4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 4324 bytes

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