Malicious PDF — malware analysis report

Static analysis result for SHA-256 0646d6f11f38b01e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-20 11:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ade2f383a0000d6a4d0cd8e7afe41da6 SHA-1: 265835f68829a3e121960d7a3787e92e9ade3158 SHA-256: 0646d6f11f38b01ee017c77790a1135a21183cbdc006c4e56a9c56b271e8f4a6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

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 http://munsusa.org/userfiles/file/20210601104215.pdf
    • http://alhouti.com/userfiles/file/lupetonevukoj.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756c17d08e4---48523884363.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/24185209598.pdf
    • http://sns.hu/_user/file/kamar.pdf
    • http://ed-web.cz/userfilesfile/84310065258.pdf
    • http://davidhammerstein.org/userfiles/file/66104023860.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074350200b35---xezab.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ead44d70---xezupofurumox.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d452c1faf---danusar.pdf
    • http://smeeing.com/userfiles/files/45975343748.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8eccb520d54000c3ccafd3efd9cce095/94630191508.pdf
    • http://qqsbg.net/uploads/file/vakakerik.pdf
    • https://bbmint.com/userfiles/file/ruvopekidokapebarazagibi.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nampbus6sb3ulhlt7312fatjpb/94271921199.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/pazoraj.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1fc9e9b9bc4e72492e555fcd1cc4d17a/82698056194.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee4ce5150be1defb9e2be1d5b1da1262/kizovu.pdf
    • http://bekkercoon.ru/ckfinder/userfiles/files/zagogigezexurutivo.pdf
    • https://combrooncom.com/contents//files/33188065717.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/tixutirusifototidi.pdf
    • https://fullgame.hu/uploads/files/17796752503.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o6h8ipk060p2pufsr1kuj0lrcb/35571280915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+muscle+testing+grading+system
    • 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_off0000e8d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
font_01_sfnt_off000100ec.bin
edd84d327b464514c319f7378bca85f30fa2951bc0d07bed764d8ee89977273d
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 10800 bytes
font_02_sfnt_off0001198d.bin
306cde838d398e3b65c4bf03c1311c0e9ec6d55cb544d064d42f14863cc0c16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 17828 bytes