Malicious PDF — malware analysis report

Static analysis result for SHA-256 a244e0b80ae0a8a0…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 812aeee9c03384c8c6f259fb6146fbc2 SHA-1: 30f4dcfa27b790b5333ece5bf1a177f6a3d97b6b SHA-256: a244e0b80ae0a8a0473bf7d431c0e7c6c1fc71b7dac41d041cd5e4e70674140e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maxflowfans.com/userfiles/file/35669059479.pdf
    • http://ankaser.com/userfiles/file/68397959492.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6a03d6ed0308fba0ca1effcef6b86ea5/togibew.pdf
    • http://yfatc.com/userfiles/file/6802701406.pdf
    • http://pphjako.pl/userfiles/file/77415247009.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6bnc0k13ujff42euphscm3o64/felogajudamoragateduwuzu.pdf
    • http://btc-ltd.com/upload/file/junobagazamupet.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1e7a6eb239f3918c9e3beccdeb46e275/5313458131.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/88401539272.pdf
    • https://agatanorek.com/files/file/gazisosumukuguno.pdf
    • https://tecnibat.net/uploads/archivos/tuzobamupumoxasobivi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160886ddeea91d---nowedarenugemexunikudu.pdf
    • http://benevolo.it/userfiles/files/jasoxipenavirewi.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/23374018904.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608485fb6af72---60527426846.pdf
    • http://scbczy.cn/up_files/file/20210613_123702.pdf
    • http://skogsformedling.se/bilder_umeny/File/mujexijotax.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a2d17fd687d202954d263f9ce0a90b5/56449792496.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789ca3bd---zororazen.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/zabinebureromaxuvobowuka.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/973322a1f0f6db72d408a72e10dd403b/95569859363.pdf
    • http://www.deep2001.com/images/library/File/nazaxim.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/q4j2ubagbj3l5parfv80qqjj6t/18647461062.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=object+with+letter+o
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 16792 bytes
font_01_sfnt_off0000ff52.bin
0e9c2dd5a6b76d8bc8de703d51a841aa489189eed3a6c3cabf2399bf4887fe94
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10276 bytes
font_02_sfnt_off00011691.bin
78b962b3287570e1a6a2e640f8a929593f7d71ad5e062ac941ef3fd6bf58adc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 17228 bytes