Malicious PDF — malware analysis report

Static analysis result for SHA-256 65414b975ca464ff…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c66e813b7be50c85ac9c6e3306951a0 SHA-1: e0285a894de9f2b425e80e9581023af3bc4aa799 SHA-256: 65414b975ca464fff4bc26a7fd2f8a0594fa9ab936de7ab742e5571832a86ad7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=chevy+ss+manual+transmission+2015+for+sale PDF link annotation
    • http://planetamama.ru/files/file/40177356238.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/52093709069.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/62579965319.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jabisowidafadives.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2f5463ecc249cba0b09011a908167b34/43044761081.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5da8b2321bd7be083f1d30230af97eab/3692335838.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/96670910246.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/mewomofabobelolawemi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/fegekilirujujigodujefob.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/02396bf63c0512d554fa38627e585d05/gidotebepolajamotoro.pdfIn PDF document text
    • https://agatanorek.com/files/file/41609243665.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/38386371228.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/gutulafil.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2861dcd92---pufexubepeledosimolidoru.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/nenolikukola.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/patagajuguvazovofedagami.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3822b4bb45---20498348250.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/giruropewopebesude.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/12868344129.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jovufudit.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3e298402---47903891055.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f431dc2abf0ad1718199fbc275896c00/12916762787.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/razux.pdfIn PDF document text
    • https://mmtours.si/uploads/70954038747.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125d51e9facb---kurirafoxenefunad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 11220 bytes
SHA-256: 0b1029b6b827a1848a78a77f837f41f295500f2e47ddcc2ba4c9c80db179ee08
font_01_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 18196 bytes
SHA-256: 2de8b4f30c1b0dc255e83a8637af32d1008c87d69339fb8722098874507de4e3
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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