Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1e80a6f6739ce8…

MALICIOUS

PDF

84.9 KB Created: 2021-07-12 16:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1632bed779a063ed3b2adc704d2a28e0 SHA-1: 89259aeab6f51be37eea644af1467c48611c747c SHA-256: 9a1e80a6f6739ce8735c0e3ffc5b9a65fb634f05d398f012b144fd3bf6cb6e86
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or to host phishing pages. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072391f8d0ae---natamo.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c20712862a143a13746f85a118aaae49/rafenogedojevowo.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8663c0d685---40925262748.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tu5t7a5t1ebrj7b19mtee7gn48/25013393265.pdf
    • http://amon-syotengai.com/userfiles/file/53628293001.pdf
    • http://shs1977reunion.com/clients/41590/File/20272244676.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/paledog.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdf
    • http://speckrepeg.by/UserFiles/files/23711476264.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab7c7c627---14702415700.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c49411d2baa---21775988895.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6vfkfd98dcs6ejbmeumkktmu8/mukovijukujixukokaba.pdf
    • http://rheinmotel.com/userfiles/file/38816530765.pdf
    • http://skyrybupaslaugos.lt/uploads/files/96897078559.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7de51f6f5---66439735630.pdf
    • http://edu-family72.ru/content/images/uploads/file/54416102700.pdf
    • https://moveo-sport.pl/userfiles/file/80612592543.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b38637b8---57651645992.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f38bf802ba---12240348337.pdf
    • https://medtek.vn/storage/file/40658013514.pdf
    • https://systematix.pl/userfiles/file/46810858851.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/399c19338da7fd02480d516e396b40c5/lezas.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xajetinenisukavapanuwepa.pdf
    • http://rollfactorytogo.com/uploads/files/23476808756.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=spanish+is+official+language+of
    • 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_off0000e771.bin
61952220b3ff3ed17a2da3d88c0a7fd493e09778af93599c0fdfd2bec37add02
pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 17652 bytes
font_01_sfnt_off000115c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 16792 bytes
font_02_sfnt_off00012ddb.bin
743dae4ab53615e2ec28aac54edc8e40203a97fb55eba7546df7110654ecc99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 10736 bytes