Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ef107ce434e7db…

MALICIOUS

PDF

90.2 KB Created: 2021-08-04 23:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05dec6b49c0d1e0a214879ac26fe0d24 SHA-1: 7f6461ce823d8945c580a3cad4e180ec5e091631 SHA-256: c8ef107ce434e7dbbe1f453f74d08ced0e19d14127c157a6591f4ffacc376453
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=our+five+senses+worksheets+kindergarten PDF link annotation
    • http://cappellastudio.it/userfiles/files/18316933071.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e80c452d---85168282771.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/58399732993.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/67166186580.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/6448023650.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c4ce2471cb3ee33c0505202e1bd78d8f/gonabuledezazurulu.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/40s79uqh00nf9mk0c6unesoinf/funomumowetakefumavi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd05547c2---xasabesoxebo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8801ced44---rivumalerisolofakiwun.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ece5ddb6df18e6c39a444b8230898f6e/175720252.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083458c11374---7533664345.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607584c0f1de8---66079479065.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2c1913d5---titadejegazalavugu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bahh2m3aug0jtgbvujuua6sso9/lelubexefipozikibukesilo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/guluxixelevipusewu.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/77399849517.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2f9da58e---bamaz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5fc220298bff8aafa779f9fe10eb895d/perinu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/53311952149.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/pudegiporiruwurowerug.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/kivurevulerafujabaminif.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b038a81e20---34094207321.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_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 16856 bytes
SHA-256: 459767684b24d5673de185dff5c056b6063f983c559a0ea1d4832678eada733c
font_01_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 10956 bytes
SHA-256: cb392c37b4f91dad7b22490f8ae048e16574dd83802256770a208042c9ebd7fd
font_02_sfnt_off000141f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.