Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b1e8d3a4acb9aa…

MALICIOUS

PDF

89.1 KB Created: 2021-08-19 14:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4d1e6aba64a8b6fe0a46f5f4003bf948 SHA-1: 8dafa2309ed57a33ddc6e2fa5d93c606fb425fba SHA-256: 00b1e8d3a4acb9aa72872107989f233aced15000820be70c17c4023b2514ed56
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://phdpecs.hu/userfiles/files/jaximesuzep.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad43279de6b---71988924766.pdfIn PDF document text
    • http://proxima-design.cz/files/file/20452309078.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/64331288262.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0dc1699f03b44cb7cee5f8ca85e38298/30328549542.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/ledonujivekejaronanon.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086830990996---58160361824.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16213743819281.pdfIn PDF document text
    • https://kamedia.vn/data/file/penozogajol.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vititexuvaropagolo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1483288af---sokijatuzusojovadimoz.pdfIn PDF document text
    • http://evola.it/userfiles/files/vexeripivatesavutezamel.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/fa632b13e3432b1135410afe2c52ef49/dotetuwureganir.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a17cb7da2---fejewuwunemaxew.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/73319549953.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1b5f0bf6c5b318c91101e3b66f573713/wunab.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/gepadezudodixasovebubex.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/507faa7234a2a0c8fb6afa00d1aeee48/jafanimajana.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/85732255288.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a456440e0c0---10784592804.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/bidususis.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608832c8eb1d4---61315390194.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/06b7ea6d69df97376dfde448a7832f11/19532453694.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/tdavc13recucgj4gj0uo485vti/buzejuxufiko.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/55684328286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=must+should+could+would+exercisesPDF 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_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 17336 bytes
SHA-256: 0cded9c3feac8e4cc7cbfcdbf946f2ae033c2a1aa79fd2d440a6146ba11a9d86
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10484 bytes
SHA-256: 7998300f8a1e9ec062fab203068960aa367b09f8a9aae8964e0aa144423288f8
font_02_sfnt_off00013b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1