Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8ff9f1a8280ba6…

MALICIOUS

PDF

77.6 KB Created: 2021-05-10 03:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2011f33baba6cbe6d80d3d77b7b2b56e SHA-1: 1437f815d265f28d8d1db0b301abf9d7932e2f30 SHA-256: be8ff9f1a8280ba6b25b9ce7451a8ca1778dff0625f7c791d64d3bc3431e833c
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure itself are indicative of a spearphishing attachment used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pistant.ru/uplcv?utm_term=hahnem%25C3%25BChle+photo+rag+paper%2528+17x22+25+sheets%2529 PDF link annotation
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0e21e32e8786dbe59452a059e6404a13/bovorojepasafetezefuta.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44a01422e---poxitazepafanatikinifi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e2b148f4c8bc691804da56c08f6e85fd/musof.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71b5f2170---58955747579.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2d4d85403e215b972aa3b11ca4924ae9/fobolejudeledatuzepemuge.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63286e91b---zesemumorinibag.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d561614f6fe395ce05081841656d8b2/ziginabul.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/tikafidanisolipakenisotuw.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/92849946226.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6849b3524f0739802eeb14142c752eda/49786929487.pdfIn PDF document text
    • https://atl-50.com/files/file/67834009458.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/26609147980.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fd6333c0---nelorowojiret.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f3eb17f248ff2578348b91bcb681eafb/duzebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 3184 bytes
SHA-256: bcdf1ec38baffcc8ad8fa3fb109ab55c557f24077e68e12c3c5c8ce6c3c041ab
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5924 bytes
SHA-256: 86cbc1af803667fb4990df657c2eda9ce05e6bfdf99bb4dec5ca7cf7aa5b81b5
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 11248 bytes
SHA-256: a7f6481b79dc571c43a4af0489f3ffea0590a658dc66ce6a6811a4f26f408bc7

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