Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fab99518e4be2e0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 16:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bccad32e27bf0da22dd2fda8db1552d2 SHA-1: c1115ebadf4e255f998aa63fcd07b97ba1ece015 SHA-256: 8fab99518e4be2e0459a3798fdfff83b72cfb95a08f927a9072c223002df6772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://drafthe.ru/uplcv?utm_term=naruto+games+offline+apk PDF link annotation
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0a7ddc25---815588724.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/19187104010.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/10179063688.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/28237418559.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/naroxagezobewobawafamij.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wutasewularir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acf2a8a72---legafo.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/1265823457.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/65794985669.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fapokodusuvanaximawewone.pdfIn PDF document text
    • http://tai-group.com/upload/files/musobivoxesaru.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nemegoribidokuro.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/937378970.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/82140631192.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210908045807197197.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/joluxeriputorenuzij.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/8179434911.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378ebb9e2b8---82567397502.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cdcbfed---xutipaxufutamejokap.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6a1d392600bdad3a5626d0a7678c2fd1/xupagofozozirutefosuxegu.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 17168 bytes
SHA-256: fc6236e606561480c22e4a2177b794ab121a415b09c0205156eecc1569fa373b
font_01_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 10872 bytes
SHA-256: 11fa54b458c4219aebc5ffa76bad880b4968a19f8565b80d9cc7e18d358f94e6