Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1dd13db93f39de…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 12:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1545d018be20879104b97ad639c30257 SHA-1: 6a20c8f36c71c520e88dd1f38e6f529c091136d6 SHA-256: 7c1dd13db93f39dedc829fb7dbc75ce1b4cbae08cd811091b0c280e82dc17c24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=123movies+mulan+2 PDF link annotation
    • http://fabtur.ru/upload/files/kozutexamerotajifageruke.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/76355358448.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/25ojjbuld02nlib74a40rteo0b/69595921212.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/wulasesofolebunekum.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/83a3c02f143137c106a918d42d8138f9/2618009510.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/24654666099.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fatajejadobinikevoz.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pipagagifavabisusaxisi.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dipisof.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sadanonifepalobuj.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/21039932924.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039c54acd---vivomirimopuxesonaketonu.pdfIn PDF document text
    • https://ahha.az/userfiles/file/dilisagemozomipeke.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/92564848696.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/12434325148.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///40947645910.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/61752877017.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/63393022360.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/jawav.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904003015.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cmqct4qdbmbaorje7vcte5sc9b/97877424439.pdfIn PDF document text
    • http://geasit.it/userfiles/files/84337301544.pdfIn PDF document text
    • https://durimawar.com/contents/files/bober.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/fimilagunedodegebareve.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_off0000bbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBE 10484 bytes
SHA-256: 8faf64fa8763df36c57ba25299a09369d704af395fe19c5ed76b2bf9ca4aaf4c
font_01_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16860 bytes
SHA-256: 290f19b4238276ec1bc694ca6f5c7710041f4f16bad8239dc786366256b144ec
font_02_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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