Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0efbcf6ec00297…

MALICIOUS

PDF

76.1 KB Created: 2021-06-20 01:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b68f5c3c1567dbd1915e54fa5cf2ec80 SHA-1: 969dcf675eb5438c28e7d78dfd5962d914f4c5e4 SHA-256: ed0efbcf6ec00297bc18a44e54a8a2e06d8b4d4884a5b1c4d01d6efb47b7a1bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=the+witcher+season+2+online
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6qtcf1ejnhv9fhv5a2gikus6g9/97724115814.pdf
    • http://polkovnik.su/upload/file/xositebejitefipirotune.pdf
    • http://mpti.ru/userfiles/file/degupuve.pdf
    • http://aisef.org/uploads/userfiles/file/file/35915134850.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd539dc2c0a---fawalakibulalenavaporew.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9170a60b4---texalivinimo.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/dc0850a7ac183df6e6c547b68c0afa9e/90074830506.pdf
    • http://gintaras.cz/userfiles/file/38295476631.pdf
    • http://stonebreaker.at/badijeri.pdf
    • https://liniagdanskzydowo.pl/files/sirunafodobumegokefif.pdf
    • https://semagro-msw.ru/pics/images/file/61500964931.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7c7ce7a0---33954925478.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4489514c0685acff54040a0a339e6e69/ketosagakomato.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8ca960a5c04fc22f8331b5e43cc9ca03/sodeses.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461a7a01f9---40286545236.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/737bc76d0337dd98c2de9c913b46c8f0/66788777027.pdf
    • http://banghenails.com/upload/file/53606456017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb93.bin
b0022cf8327aa92479066be45b78fa7e7cc109cb865b394625cffe18630ba356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5060 bytes
font_01_sfnt_off0000fcd5.bin
86757344dd15f5af890a7d6e3b19511c3f4bba056c8846fb91982f7d2d7eb061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 11356 bytes

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