Malicious PDF — malware analysis report

Static analysis result for SHA-256 392f05f9bbaeaa01…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 03:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aa6b77bf10c0589489c5a1558e59cb1 SHA-1: 81293c8cf3a6ee34dad2c900b5ac64d8dbfdd977 SHA-256: 392f05f9bbaeaa018b97df599ac7924ac1bfde7e9e9c187a8b3e102084dbf1b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cowichanmusicfestival.com/userfiles/file/64619580612.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3fec8c28---8472021879.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/31426872020.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd47e90d8a---90178193893.pdf
    • http://vce34.ru/attachments/file/92508769562.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e16670970a98b627e63604535c5aa2f9/85298371252.pdf
    • https://tenfci.org/userfiles/file/zuwoxiwototov.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc53c6ddc---24962678288.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4a2e0f7d446ae5a90b9af6fcc093b4f4/kabexexakipevoparusu.pdf
    • https://hondamienbac.vn/userfiles/file/95868995479.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7d786584---kebopabufez.pdf
    • http://robalton.es/Albums/images/file///gitale.pdf
    • https://starbox.fr/img/files/tibomifepukosubosuru.pdf
    • https://0900107678.com/upload/file/73571381451.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a8c23682dfef3394ea25a1f836871c49/56156338482.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/oc7817jaouv3t6f2jlj315qot0/nadudidikukoj.pdf
    • http://clairerolo.com/userfiles/file/6040875418.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ac8e2c31a206bde10fc3d2b4e76ff1e0/xunem.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f33308d20---57732437713.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d0c14e1e---76233700386.pdf
    • http://marinapogon.pl/upload/file/suwolukujixibemapaxed.pdf
    • http://bpabv.nl/uploadfiles/file/fewesedefus.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce70bec9f---92691918949.pdf
    • https://rumusjitu.com/contents//files/61410847795.pdf
    • http://studiolegalezullo.eu/userfiles/files/73672833308.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/45454dd6eb883ce267bbfb355bb885b7/25603769396.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=malcolm+in+the+middle+theme+song+lyrics
    • 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_off0000e79e.bin
434b87370ee275eb306c2edb4ab7e8aefb4cae81aa2a901447c91c2354128137
pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 17324 bytes
font_01_sfnt_off0001144b.bin
9ff5ebb146856c5a56a08abc92439fb59be38c0892ca55c9350eccdd4e7fb0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10924 bytes
font_02_sfnt_off00012d36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 16792 bytes