Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7c70ddc2d7acc5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 13:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86b8538822f4f573db07d31d16c4fbaf SHA-1: 48506a1d0694104fb7e9cd3c3fb3d2432ada94a2 SHA-256: bc7c70ddc2d7acc5a63de197d419cc12169a0c4a6863fee01ec4815a82ed6889
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially untrusted domains. These links likely serve to redirect users to malicious content or phishing sites, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9c4a1d724065fc7fe98817986e3065f0/79996766717.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0fb4c12c---kakawofajupurudipox.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610564274a3a0---bexijufevefewufazodav.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071b52c56163---zizuwelaketodosis.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3dd21372---76532685435.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/likipilebovawajakow.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217291534443997.pdfIn PDF document text
    • https://isleo.com/i_photos/file/4471849658.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zizotizomimorufabalesin.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/43924475633.pdfIn PDF document text
    • https://aashianarealty.com/file/17096603175.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/wumujazo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/79b27ccbca71899f00aa28ba630cfa2d/lomogenepo.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/jubemowederabesi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/77075970064.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5165bf3bf1c527f3e515ab6f29588143/gibobemi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/amm2j2ovh8q4brmprumc3gc7hu/jedifadina.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/798e4db5f35354195c115c1b6fb93c60/80204946548.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/8c01bb376db7410a811f93fd06ffa3e6/80750180809.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/xakezafi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/969ccb7a3c16b2dc8cd3eecb5ca843c6/lutitagelanagipedoxixo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/79574930589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=overbuilt+car+crusher+manualPDF link annotation
    • 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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10704 bytes
SHA-256: b30f488948cb45c02b444cb9be193df2606121d76f2b2d5751355f7a79f0f7a1
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 17224 bytes
SHA-256: fcbd55ec03599b3229c5aca202395380bc097a7660f82cb4413baefe4aecb53b

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