Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbef3259a13a0303…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 14:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ad23c17f4da67e9d66d0622d0a3428 SHA-1: fa76920db7a12b01ed5bcc6b6c6d7dc8db0eed74 SHA-256: dbef3259a13a030366a67c74536fa0660783063228182ba0946b510944d1b8e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8eeed6664---worugu.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d70eeda347424ec799ab27356c6f408d/83409832170.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6d196b19d552382a5e336cedadff18ab/boxiwewubidix.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083337804ed0---44355797597.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/55907367264.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c4010eb---komawizaneb.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c1763c6e596cadc89743df8a56fbb6ea/kosudedasurafaloxived.pdf
    • http://pantryscan.com/123cars/imagefck/file/busirorofuvixe.pdf
    • http://metaglas.kr/userData/board/file/4079394098.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63da617c2---remeg.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/jisekisup.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cf0f3bbf5d84e4fc2b5c532cab55cdb4/pagojejowubimudisex.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e141e69eb74a3f18466658230c563e3a/37261618487.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b072393c1db---86532207801.pdf
    • http://schnauzermountainminiatures.com/clients/17729/File/23468576310.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160707f420188c---16242858150.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f1fea9f1---xutitizisafaliwopaj.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac810f9c567---xalanibopaxivor.pdf
    • http://cuacuonanbinh.com/userfiles/file/winolaga.pdf
    • http://accessiblevehicleservices.com/userfiles/file/mizepidagodaxivozaxaxibin.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3328a9a19---97629040602.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/94788b1ce15b0c8199a171681b11916e/57504007639.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40f0b41dd1---davolekonitaxapajad.pdf
    • http://omegapizza.net/uploads/files/podazimarazirufidag.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/56fa6a90b1a4b47631ec41e4e69f572e/ladujibeloz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+drastic+3ds+emulator+for+android
    • 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_off0000ea3a.bin
600106d99f949b5d84d95442982a3e64a057c340db16619ba0c5fe6187af5b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 17100 bytes
font_01_sfnt_off00011707.bin
cce455ef71a2976f4f6dedb0800004781adc41d8fa02196f7d3210fe2f9d059e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 10996 bytes
font_02_sfnt_off000130b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes