Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9b931bbc4986d6…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 16:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07bdbd3f8abaf65c72029d91d34040a1 SHA-1: 298695563879b302b2e808e7dd567ea96d2fc98d SHA-256: 0a9b931bbc4986d6c3d0dbd7d2d387466bc9e68a1f9a624e6086ee331c34c5c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Some of these URLs are hosted on compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chaitraglaze.com/uploads/89945998336.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/046e821cd427ee1bbcfdfd1595ee7b3e/likamiwojatekemalebulug.pdf
    • http://medicapoland.pl/uploaded/file/biwufesud.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/nimuzevomexarigizel.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/surnl245opms8cp3qvn1ubkd62/12837512036.pdf
    • https://okazdedziecko.pl/_files/Media/file/mumego.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g6cvh7d15dujb6n9lge10mbtdf/95988006187.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/31242426655.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a245b228f3b---kitujorefu.pdf
    • http://kelvista.lt/images/files/28190117848.pdf
    • http://blankheich.de/images/uploads/file/riramatezo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d76347dbd---visof.pdf
    • http://tourister.kr/userfiles/file/laladugijajufe.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce41d2470d---zowunav.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a5b513f4---65936739702.pdf
    • http://www.pranabkumar.com/fckimages/file/4609196883.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/74kc4h88b6fasop29jpr32nate/junofewujafejeverivig.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5f0ba4bddd8ea170d722861ba3e70273/fedavedabafu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0uph5hco70161ov800tt2i9b1m/polidesovazifi.pdf
    • http://cleangroupbd.com/ck/upload/files/27302132859.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c07a13365---77848013459.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe2f4ed09---49409289726.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/riun5lr9jo9c3cp6jcr11nubo3/mikixede.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=frog+and+toad+alone+pdf
    • 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_off0000feea.bin
e3934b7f833442987919333404ae482d403b7285e31d63850f959bcdd0be0532
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 17620 bytes
font_01_sfnt_off00012c39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 16792 bytes
font_02_sfnt_off00014450.bin
e27d560478b2a1d40eb69ce71b6c6e8b71472a6ac56fdc4ec33da45825183a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 10392 bytes