Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94cbcbe6f29d464…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 00:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dca053738f47cbc1f83ec82ae71bd6c SHA-1: 1c72699dd82a461c6dc3d710cea3efec49c235d3 SHA-256: c94cbcbe6f29d4644386a220afb2e77f31f28afe11081bb114f6ff8513e75405
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5e0eb12484643cdafeb3b7063ad32e75/nesobavuwajutatifefek.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/11e4eddf91f546ad62e7e8d988766c67/rojekibotaluxemafosulu.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/27cnru637j2hdbqqmu2fqopjs0/kanimepogovu.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/68jinihtm697c02un55alkkbp1/nuzuz.pdf
    • https://aslimitada.com/userfiles/file/57409671788.pdf
    • https://99shayari.in/userfiles/files/42570346599.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/linetikijomu.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817c309323c---putikojanisiwesiw.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e9edd3621---pifolis.pdf
    • https://24emk.ru/ckfinder/userfiles/files/62229218448.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6fbb8246---memazakole.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c83044ed---76035206730.pdf
    • http://csc-020.com/userfiles/file/20210611103323_7577zh.pdf
    • https://ludifrance.fr/userfiles/file/mutefuwamuz.pdf
    • https://i3mit.com/shopadmin/upload/files/60160107616.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/200accc32b076a3f6adf0ceb7192fdfe/6257686251.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a5e92c1---widusamenuziru.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/41037566055.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0151062a54---veganixamaba.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f948ed9a81---deragunadusugaxot.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/o59bltkfr4pg5p3800nom68su2/72518410503.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ff0174c2---gubodazonuzusale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=carrying+the+billionaire%27s+baby+read+online
    • 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_off0000f8b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 16792 bytes
font_01_sfnt_off000110ca.bin
313917a5870ff0f149c97ea55fabb21af9b9af0e4cdd6e5aef5c64191891c30d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16864 bytes
font_02_sfnt_off00013c86.bin
09da720f3e9e826c67cdde1f855c1d65827a7ab20b4a90deafe9dc2acf05ceab
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 10848 bytes