Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d32d43d91e18d0…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 20:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46e5d8589e6cfca26a7f17254219468f SHA-1: a32e7fa0db290175577b6ddf7bfce7cc2c36f36a SHA-256: 42d32d43d91e18d03905e41594d6c4394ce4b6d283b20566a9485526315f57d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm for SEO manipulation or to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=cuanto+es+6+pulgadas+en+metros PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/32024817105.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe4d6d027---83472777148.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088039bd90e6---lafawer.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5bc4b7a2061c225142227fa36760dbd7/76812911907.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9658727c5a968ec1fb6907b59f1d2014/50902858974.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f7986d5a1e184641166f244f4a2b9307/ruwas.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/65c81d0765974def211927691d353f20/sakogixewunafawosojisugem.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/rapumo.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/jodikatogasorura.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/34257067796.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c70a3211---ragabameduvaj.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/095468eb80d729265029ddddb84e257a/miketan.pdfIn PDF document text
    • http://kaies.cn/upfiles/210602175350383434isn4tz.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/firobe.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160754642cfeaf---jexegefag.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/23989916367.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/11951431443.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/bizogekufawadil.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jf18i5p2fligdcvo3iik8iksjc/70811492403.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/oin5gc9hhronljr7aou6hdoq8n/21702219606.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3dc80e01316e768b0468dee1daf6cbe3/jegagase.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42164a4334---gupapukuxax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6a78016ede655337995d24935c60da57/11280173722.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777289a65b0---jugaxoxekizuzalezurulelot.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_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 10940 bytes
SHA-256: 9c76b62cee817940629ebdceb8a9e4e729bf4a126e7051341274611d88413806
font_02_sfnt_off00013c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9B 19428 bytes
SHA-256: 9fa0e6efd24321bdc3743da8f30fa47fb2a7e5bc6eb97df34f36a2b15d2277b2