Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c77a1ac7b312e…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0e2ef5efb9f9e8f1a51b517167674806 SHA-1: a396ea8666efd1772f53ee7a37522f92c3290684 SHA-256: ac4c77a1ac7b312e2671ae08b20212c1fb7ba85d19c6ac6728b1e44b1916362c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://nomylo.ru/uplcv?utm_term=what+level+does+rhyhorn+evolve+in+pokemon+shield PDF link annotation
    • https://digireg.dk/upload/pazikitenegegevomozo.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/mezebapuminadisomasixum.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/vizebafeduwivuwirubip.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddcaef53f---zidagivuvew.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/zaxezebov.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf001685240---gefanipate.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a0de1adb---xijifulipitori.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/82435183869.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6117d2aa6d---rawezuvosemuxitunugi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/powixos.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8438be5bd0---pajifilu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/jaxivili.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/vobizupunoretafeninixe.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086408adc298---sevixifivotojujiragukira.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bfc9eb77---pitowekumabotaferaxabu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2a496e8841a3cef525b2e3985c2975f9/96448276167.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f03708970f9f7de68562c61cc45a19f5/11556828880.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d270b4f06---22156796504.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/972cdb7a0325bd58741c95efd9c5f4eb/79953486120.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zavoninabakenolizirubod.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/fazux.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zugixa.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a06a8c62e94820d950ae706a2ecaa6c4/guwelizawowu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160814c4314624---22958010781.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 18352 bytes
SHA-256: 5b6a27ce8be1c09863df73b7d0336dd0b2d7a16a4f985ad193c2becccf518f9e
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10920 bytes
SHA-256: 38a842ba7393b38980f3a90b2d6d115c58efad4307d95081d7bf250dbb845546
font_02_sfnt_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 5876 bytes
SHA-256: 643f11bf04f9dff6930f9ffa735b4a2b2da79e4b0dbbb32edbf0ac4b83193779
font_03_sfnt_off000150c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1