Malicious PDF — malware analysis report

Static analysis result for SHA-256 800e4ae40a190fcf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 10:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab1a648ded074edc988d65bc3f7f2344 SHA-1: ebaf07bdc50ae75a2ee24cdc5c612eb31c0ac702 SHA-256: 800e4ae40a190fcf05ec6bcf272dfa094ef1c4371b6f6a9876b3a1e4da91392c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing to numerous compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2b2a1b00---558687732.pdf In PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ralalizam.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/baziditarefisupogetur.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/82704079443.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087da70e0e10---96583971031.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f4db7dece278d38ff304e88e1f1386f2/wumujeteri.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/82435183869.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/133d1688d042c80ee65e77507c864014/54852349524.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/jamafegepeboxaronipu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34cb6766f---85668481368.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612e71fb0ec21---97189623327.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c4ae5eb---18199647006.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/62551039724.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tererurukaralafejifiva.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/niwekutipujuzijad.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/wimofofavugux.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfacaa319b---xenibixoxejunova.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b67a84d7a---11791754911.pdfIn PDF document text
    • http://vodova51-53.cz/files/54007038605.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/sugakakamikeromujiro.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/59837044740.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dd08c136ae60dc75547424b91c5e9aa7/tudadadinizeruzewito.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/30utb2fglssmotrjigd6c96jm4/gebakepawilur.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/dudatel.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tunakefarobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=smart+recovery+worksheetsPDF 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_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 17868 bytes
SHA-256: 684bc4f5ff9875f76894796300dc7f8a5a14470a6e98630ed143c1ddd1b830e6
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 10688 bytes
SHA-256: 485eca77bb9ba297de4f9289d5afb0beb24066411f8a53045af8a9b7228155d9

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