Malicious PDF — malware analysis report

Static analysis result for SHA-256 370b5ee0696bc6d8…

MALICIOUS

PDF

84.3 KB Created: 2021-07-07 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5055cc563e978a02710b9be8f6e40de SHA-1: fdf5d954b8811e22dfee4182fb34da9e18f90a27 SHA-256: 370b5ee0696bc6d88bb9e8fa519ae70a1ac0a20ff16b06178b2a484e972e7eaf
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting an attempt to lure users to malicious destinations for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/s3sn4c8fhubqigkqa8ernhd3j5/57824299929.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/804f2903883586d5c0e20f02607246c3/13731231339.pdf
    • http://braciszewska-klimek.pl/fck_files/file/35463643130.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d02bdfda---49204050626.pdf
    • http://werkkledingverkoop.nl/images/docman/files/75164791863.pdf
    • http://praguetransfer.com/files/file/lugetopaza.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/u6faif6st8vhpsmnjdkp18i594/45203186210.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/1sj6esush4jd7fivi6csv15h1s/vagojasifejavu.pdf
    • http://innospectrum.eu/hirlevel/file/30946394604.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d13dbe84---zakiju.pdf
    • https://blogsma.com/files/244726523.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28c9e5d6b---33042875304.pdf
    • http://martom24.pl/martom/userfiles/file/55949081541.pdf
    • http://karinameal.ru/imgdish/files/vanubodupo.pdf
    • http://fittbike.hu/files/file/xinevozalezagunulegeted.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/09eee4c0ab7849a6b41ec52fccc8a306/92016085566.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bae06a0b9f53663e36cd0c64549248c6/guzixuburuluwofiv.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dm9btm7bifa54l4kerb92g7k43/jumakulaxatujunivuk.pdf
    • https://egyptsuntours.com/userfiles/files/gagoregejalewojurogusopop.pdf
    • https://topclassgardening.nl/images/file/rivotot.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/30b1166b03f2837d2c63ca77a211bbf4/47647654157.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b60eba9---jaxid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nth+term+formula+for+a+sequence
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cda0afa0b3f1c2433f5d4673f8a1851e/rijopatisurabaxu.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_off0000e4b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 16792 bytes
font_01_sfnt_off0000fccc.bin
f0993bfbb39397b1a816355e5f25481a5ef319d194a00f52de4f36a7aa97ac22
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10732 bytes
font_02_sfnt_off00011555.bin
73105468bc107333da9ef7db582f37435253f2d686c9fdb4d7a542d01edb167e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 17868 bytes