Malicious PDF — malware analysis report

Static analysis result for SHA-256 087acf655e2334a7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 12:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd9b9c9d1722121363a19a886e01b668 SHA-1: b50e832b826979d3a51e58146f70d5769e7f37db SHA-256: 087acf655e2334a72b20fb36d7234da95bc4cb8d9185a996a812b56dc0c14865
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary function of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=bible+names+and+their+meaning+pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdebe047394---493619548.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffd4a3d6a---12862462910.pdf
    • https://apsco.ly/userfiles/files/77751514597.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/mekovozalaw.pdf
    • http://sushiloverca.com/uploads/files/85450322214.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6f607af4---dadesigagobibatotu.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/67403940054.pdf
    • https://sporyolu.com/resimler/files/43108756622.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/87070099585.pdf
    • http://ajivikafinance.com/userfiles/file/vekiziris.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6f270e37da6868928268b65caf1370d7/gojixagetemuziverexa.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210710_88AA6C65A199D39A.pdf
    • http://milwaukee.center/userfiles/file/sufevupe.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/086a4066d4f3b1a0d74b9749421fe0ab/kelibusevogomilolubu.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/785a8d1008923a2924ab1d208bd28aba/ledusugefoveduxadesel.pdf
    • https://badrivishal.com/media/xizuxetigazudobuwasuf.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c1f4a7bc23b3ee859620ae73df864ea6/selifeseluxavajilivetu.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/05d70fb35c0e6fdb72ce824ef6d6ae23/zikimup.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fee9bbfa---nepexivuzinobabenu.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7e280cfe---warike.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/612a08e21f99577105f76b48664d06c0/dukinanikutuzivim.pdf
    • https://grandhotelbulgaria.com/userfiles/file/28289286419.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_off0000c177.bin
a9adb5fbcb820f5a1f376f072b8f9dbf14c413ff34ea15dd1a67e37fa0ed45a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 17156 bytes
font_01_sfnt_off0000ed64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
font_02_sfnt_off0001057b.bin
61f865521a78e44d1e2a8503ad016e3b03f04b27a1fe154d4bde84370ce15045
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11020 bytes