Malicious PDF — malware analysis report

Static analysis result for SHA-256 af260575aa50e932…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 09:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cafada24e739e6afe709b5c49dbf5a8 SHA-1: 9c455c7193151346da689d72e77b754bd3d1f63f SHA-256: af260575aa50e932430077d23d0cd4f3c355a1f5983830dd842530fedc6b9488
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users through a malicious attachment to a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737e9db7d47---50383093525.pdf
    • http://romanakladatelstvi.cz/userfiles/file/84717017208.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9grna4tf8uua8aa1flljoa05ag/suwotavokafexakagigibepe.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51674813536.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081045e3930f---nufipegopar.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4d47ad378e3bf01939323c1e50907e/79864279645.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749736e6a28---74481476070.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/5965e8e21bd6fa2fdd7df6fda930cc7c/legatagok.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7047e4ae---18626909673.pdf
    • http://lnaixi.com/userfiles/file/20210616163158_2117698567.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/h0e6c2adlj4sc5frocp85fluji/zobanaxalatofewutozaw.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/88b536f3dbe642235be8c95e6ac9f653/60142972115.pdf
    • https://tese.in/ckfinder/userfiles/files/94934338003.pdf
    • http://buergerforum-tirol.at/file/surogida.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aucctvca4mkjrrv6q9be82tki2/dazavilexosoxigurunovu.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096b65a445---guleketanikipizamutaj.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cafu8rlqf8a7d3nqlri8a5a627/85110200072.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e81af1a5---nenomon.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa47d2857a7---43186528343.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1af41ab16f90c7f109ce9f3bb3b49b52/xorirupapagedexa.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7fbdaa896---janerimidasizafuken.pdf
    • http://morard-mcf.fr/data/Files/givemidiwelikelolewileva.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd8c62d20---2980415335.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/08ecd44933dd5d993ac763f86e528a1c/lolopifuvivub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=edm+research+papers+pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kewaxegubazenikilukuzuso.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_off0000f17b.bin
1ec58d8f12374dc1d66085e5ae235fc22778ef133e6437d8a6e937e05d114eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10408 bytes
font_01_sfnt_off000108fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 16792 bytes
font_02_sfnt_off0001210f.bin
d74d2d5441b237895402ec5f2d0c231572f60f5074525dd5fd64dd001087c48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16684 bytes

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