Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebc95509829e34f…

MALICIOUS

PDF

90.3 KB Created: 2021-07-02 10:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29afc5ae7fbab182aeae01f9983bcd42 SHA-1: 26ceca8f3bf24c56cad3b85868eb793896bbcbad SHA-256: 8ebc95509829e34f13ad45b2413248e99b3ca515b3fddd2faa48d90cd799977a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous links to potentially malicious content suggests an attempt to lure 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ec459856---420041664.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/723312a94028885f5f3a8da6cd2af9ce/voxuxexo.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf71d003fb---nosabudosaguv.pdf
    • http://fitviewer.de/files/file/22821610480.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ff47fc46---89066286195.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sjhktpou6rd3cbasbl5t3fd5qt/23657627961.pdf
    • http://altelaw.com/uploads/image/file/49247983496.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/557795d23eaceb65e14fcef99e9a26b3/kipiveg.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c57919d4---28049667109.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e60a48a091bd45f3ee5c57b483d73f28/sulevasazenik.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/berukeped.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf485b39c87---51670091814.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06194ba109---ganizevow.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec221480f---murimipipiwafekelidexosun.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b6130e0---87688490708.pdf
    • http://landia-print.com/pdir/file/rodatodigimu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607574afa1c03---sajujalilezenilelas.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7c5e7489f5720d6011b2d24b3a6d9238/94410895722.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec57075d54e8c9429f4bd888fb840fed/40743468869.pdf
    • http://christschoolblr.in/userfiles/file/62313590804.pdf
    • http://matchonusa.com/uploads/files/zatipotoxuvudemaz.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/99mjop9bkuuse1lhagirkqd2f4/21122654630.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beau+jacques+zydeco
    • 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_off0000fe94.bin
0023db1c4f9f0c55f91b89e80529986bf670904e22a17c47b288c1137cee84e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10528 bytes
font_01_sfnt_off00011690.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 16792 bytes
font_02_sfnt_off00012ea2.bin
2b89fdf6f13a22e86e0cabe6f0d49eca9ab73c6f6e389e1fb33e8e65aecb86ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 17680 bytes