Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aa69cfa5aec3a2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 13:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ec8920da0c9cf8e776a50e8594fa5d7 SHA-1: 95108d72c4147530b1bde9fc9bbee4de56d1a55c SHA-256: b1aa69cfa5aec3a2f9f981a3cbed07a4c9369fcb25f1c4c56a4acbf7db787303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malware. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document's structure and embedded URLs indicate it is likely used to trick users into downloading malicious payloads, possibly disguised as software drivers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=download+adb+driver+windows+10+64+bit PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7cc451c883caa143ca4eb00518a856cf/zosevibepolevofed.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210908_133035.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/49050041832.pdfIn PDF document text
    • http://asid.rw/userfiles/file/32939226618.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/85500574363.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f1a00638---79637717015.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/zemeguminel.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/72051514673.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630699698366406628.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/31505892913.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/walanoluduvo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/23449788486.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/100686184613716b589d97.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/89300898124.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///sawefivakokujijibero.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/medukaletoritonenit.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/15475126440.pdfIn PDF document text
    • https://orangerun.re/photo/files/tizewofotiloveni.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/takejirarejexugeg.pdfIn PDF document text
    • https://mmtours.si/uploads/71336506158.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e68af05---90963311153.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/60254990662.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909133844.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51454170644.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10956 bytes
SHA-256: 2fe1da7e4db545ab99458031def1873701bfe2f6dcb5029fe629e16700248c69
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 16180 bytes
SHA-256: 81c65bda5d0da666152c077a2017884f0b9fd757facceb12da43670e6ea820b7