Malicious PDF — malware analysis report

Static analysis result for SHA-256 4944d8c2d467c2ad…

MALICIOUS

PDF

115.6 KB Created: 2021-07-02 20:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6017d0bcc065334775588bd3f74c8b75 SHA-1: b9795993da756818fb84e73dc9d7145595d6b5e8 SHA-256: 4944d8c2d467c2addfca3eaa56605b916c542ef1c8a9fd29e6cf780a0113e86d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crewmak.ru/uplcv?utm_term=father+rodriguez+prophecy
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s080r66c62evni5d0d3lujqga4/60878634128.pdf
    • http://sobsai.com/ckfinder/userfiles/files/12923152803.pdf
    • https://xo-sound.ru/userfiles/file/boxow.pdf
    • http://netinflux.net/userfiles/file/xuwigefaz.pdf
    • https://businesslife.com/content/files/zajawa.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b6fec0bf---75892128049.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a634fc8---16977689180.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cbb66a03b6922135c6e72f41e912d612/turugawapug.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/cnil9le0rb4fas3mk0eop8r6ug/powavonu.pdf
    • http://washchienluoc.com/upload/file/kefexupefakagobozukasir.pdf
    • https://agrimal.pl/userfiles/file/44323978726.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/22f91fc53e0a882c4b5a1e15906bf9f3/6095706833.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814e7d949cb---60454340208.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ap37emjgo0f4o3moppj18i1d62/nadaxal.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b631222bf4d81bec82ffa2fddd3af45a/dosil.pdf
    • http://nousgarage.com/userfiles/file/sotixotokaf.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a0cfe06a5b02b64398f4214adec4f72/31053939163.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f328028c8381c0365d80dda1e7494d59/puwobebinokapewaxevenedu.pdf
    • http://vodnik48.ru/content/file/62218793774.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/40123763957.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/tmuue741q5ntia640k2brh4lk5/37074836445.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dv6ts01i6hicspcjekjdn2q4tq/zaginisajageka.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1ff77d86---mugunep.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/90022ea6288d5d899f307391d2f1f6cc/fakavogubadupuperukuzerel.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840697e61a5---volunedopizezekezi.pdf
    • 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_off000160e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160E0 16792 bytes
font_01_sfnt_off000178f2.bin
99dcb318526018accc3d192f44cc99aea6bfee0183de1cb2ca42b7be8bf6e4ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x178F2 18180 bytes
font_02_sfnt_off0001a87c.bin
72200a8872d40ad56444f6dc521221d29976163d7e222d5add1e803da920c9ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A87C 10724 bytes