Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff67ebbd3773a3e8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 07:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b98c6e9359e7776d5b5644870e12c700 SHA-1: d22312272e310cf546c678c737fc54f9372df222 SHA-256: ff67ebbd3773a3e8709ae935b789df2aeccd706222da149def381d9cfb5a39fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these redirects. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=different+words+to+describe+tone PDF link annotation
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed24f91e40d5faacf7165c2396fb5ae9/fanipelewi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f07171606f8a5ce5be2276758fd3d174/mopunun.pdfIn PDF document text
    • http://castel.lu/userfiles/files/48718748103.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/91768833487.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/jaduzowewozereker.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/64466323674.pdfIn PDF document text
    • https://agatanorek.com/files/file/madagibadobi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0bd4e6a0c00f72fa99c11177ba3a41b0/19738555246.pdfIn PDF document text
    • http://firegallery.ru/img/upload/reruviwasu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076581fb0170---62464457267.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9drq944fcm1n1dgt5as905ep9f/zimeted.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/xuridoworugipexisiza.pdfIn PDF document text
    • http://erictex.com/ufiles/files/54157565088.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/govamebozarakajixorobalo.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/tipenuvisepujeb.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/lijazilugovababipe.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/75563403466.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/14512015379.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/lavedunigijuvanebevi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/lujiwavugotul.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/52900013483.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea65b3592---weritokirakebotofiruzuxi.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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 10488 bytes
SHA-256: 3eef2d892efe6bedbe6450f6b8ab43f7be22b9845f12beb93aa2d272c8a5f31e
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 19044 bytes
SHA-256: 402d1498a1ae1334363e9de33209d1d16cd0cd4618bfd49f109a92b31894d975
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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