Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3d1f28957eeeb9…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b34ea7af2372c4684d145a40c364f40 SHA-1: 687e00346088a6f9f0d6ea0d4432bc19d370a580 SHA-256: bf3d1f28957eeeb9fcae9789bdc380101c0004d3373dc62c2e6cd30a72eecbea
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/0b41ee9435b9fdafe6b0c2d873fb67d9/65941029845.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f86a3efb6---34275321491.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0cbfb52b70710d9830818f04adde0de3/54733987260.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/637266dc1c8e38ea3cf36c2301b853e6/sasirizafididajazopexoba.pdf
    • http://mim2010.ru/userfiles/file/76671655887.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/752d6d2c8e8d92af4d3778a7809525d1/88661768550.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t57kos09g5hdf6e8le61lk39qd/23230532946.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e86fcf544---2339374318.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67de08d32---lejivadewerinukokokixi.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa5cab4fb---46266538700.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609edfcbe9618---59928954812.pdf
    • http://danies.ru/ckfinder/userfiles/files/zotimimifowof.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e023bfa3bf17d4e1b118d5261d52d4f1/77748830138.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/13d1e8e03760f7545f5a15e1ef6ef093/57373576159.pdf
    • http://bptramptour.pl/files/file/8801013644.pdf
    • https://nicosiacaffe.it/file/83504132237.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2u778hdv96cdlfpaj1blqlo77k/venipizadelipalazer.pdf
    • https://twr1115.net/files/fckeditor/file/fexikenaxotipasagokik.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b88571eb5ea---xumegabomiku.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/48486848757.pdf
    • https://kodcomputers.ro/2664/uploads/guzeseropamogimivo.pdf
    • https://aawyx.com/sites/default/imageuser/file/36276772338.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/16479956048.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/tawudixemikekixifusereb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=selective+breeding+in+pigs
    • http://janyska.home.pl/_mjanyska2013/fotki/file/89461599534.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_off0000efe2.bin
f31a084fe1cd611f2920c119047d4e39303bf13656979903c80ad65eeef667f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10688 bytes
font_01_sfnt_off0001080d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
font_02_sfnt_off0001201f.bin
331d506cbce4ad8ca14e3949ac44425af1e426e155bc26bbd1f73a0e26f419d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 17112 bytes