Malicious PDF — malware analysis report

Static analysis result for SHA-256 b345ae20927d8440…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 14:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5547155c55d02e451c53882136fe7baa SHA-1: a46ad01cc890fbed875bf540547d448a00d6dd59 SHA-256: b345ae20927d844046cfdee029b604d74db77521db10d9a6d15b5f2353918a78
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b257f33ba7ea056147fddf41d489fe2c/93564176862.pdf
    • https://alutat.com/data/file/kefitiwe.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fb8655a154438857552ab8c9e72837e/zotizakoxuxukujuje.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/56288cfaf1d6bd1257516a537e43062e/69974394801.pdf
    • http://yesilderecine.com/admin/editor_resim/file/37813318158.pdf
    • http://banhangcongnghe.com/upload/FCK/file/xekejopo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1f359521---31324534189.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d87a7dad---dezan.pdf
    • http://georgekoldun.com/var/upload/file/59642834486.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/d2d14d868d4bda77ae41f80b801fc4b5/mibutus.pdf
    • http://sinproval.it/userfiles/files/rexexabimi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ab9e8fc7---9869309945.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ji57rqj09f035o0kd4f3d42epj/91450494008.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/kkerkflcjbkeurcqcck6i02rl7/guviguzumoxip.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bc8778378ec6ecc916ed1b9c98d26b9a/guzupebafewava.pdf
    • http://ackerviewguesthouse.com/userfiles/file/felevilefazeloj.pdf
    • https://holocaustresearch.pl/nowy/photo/file/parirujil.pdf
    • http://st-communications.com/ckfinder/userfiles/files/rukekitosewodasasolifa.pdf
    • https://b2cexpressdemo.com/userfiles/file/savixulujibibupivonamoto.pdf
    • http://duepassidalcentro.it/userfiles/files/gipoxexusezedomuzidineko.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8350e4e40b3b70eb1f00759777933db9/tifapugasirojabaluwogeko.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letedazenixo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=samuel+harris+fund+for+mothers
    • 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_off0000eb39.bin
ee4e07311671b6795123b6d9f7c9eb09f7eff1d15ccf05874a8addeae8887481
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16992 bytes
font_01_sfnt_off000117ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 16792 bytes
font_02_sfnt_off00012fc2.bin
28f8154b16d356a3502c55784c6e0fba07dc84b9344d326a31358624b7d9bbb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10792 bytes