Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f649e3ddfd7195e…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 05:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57c7e8f0de427f6e755e6186fe929c0d SHA-1: 051ba27acea9b0d38618e0a10f61e5424734132b SHA-256: 7f649e3ddfd7195e212cafefe29d52e701813e4ce741b3de987a3df617a1f813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing attacks. No scripts were extracted, but the presence of multiple external links is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=three+letter+words+ending+with+ox
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n38b4uu7k1u67gpcsdmg5lckhg/vuxazudadekamol.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caddc81218---kerudam.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d38e7ffc4---51827664747.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a0141e16e1766ff316865365ac874a5b/21167549648.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b0c8dec2bc5690bd664d688e26aca96/12404026102.pdf
    • http://duetsepolno.pl/userfiles/file/zokifipirimokesopomonur.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823902d0232---wizuwaxinugedusim.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/183208ef7d89d9552a27bc4fc50bdbbb/romugegobozolisimafuta.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/iqf1be6iqsasmopqh92qf20bu1/mapogukefefid.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/869b2e4dab96f01b981c5ae601c5803a/2170687332.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf487b25c50---soraruk.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30953b8661---xorifurebad.pdf
    • http://sjar-tech.com/uploadfile/file///2021052001335091.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7de9f9b8b43f751d34ad90d5672b35fc/67400497053.pdf
    • http://ecohost.ru/pics/images/file/25309510517.pdf
    • http://stroisvias.ru/userfiles/file/76863723098.pdf
    • https://acryl-bg.com/userfiles/file/lepabiborozigoboxize.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/20863019012.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f07c6e230---mugiv.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088235a78801---17618763161.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2b457f4dede3f1fc32f5bb2b76dbb776/97915543628.pdf
    • http://kiavysocina.cz/UserFiles/File/zevopi.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_off0000ee30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16792 bytes
font_01_sfnt_off00010647.bin
ffdf613c4a558cbea425f322355c68ace4851b594dbc94caedcbd857af82ae98
pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 10516 bytes
font_02_sfnt_off00011dfc.bin
738c83e6572603b5d72d16e0121f554fb3a33de771eb93c0f5784cfce9df3b87
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 17452 bytes