Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca831384067c4edf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 23:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 59d7f8749dba105b9ae5a7f9a313db49 SHA-1: 0944d5f76a7716b1cdd7f74d8ed6e5c79d585843 SHA-256: ca831384067c4edfc73c7ea91e6aee0e66cbdf91c0a38dee4140b9ce5eb87ab5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document's structure and URL patterns are consistent with a phishing lure designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e73375292---misobodiliduxiba.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/618fd5cae19c025fe206980d8edefc9b/zopolezedewulaw.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/jajatijusokisodesomolotaf.pdfIn PDF document text
    • https://digireg.org/upload/titez.pdfIn PDF document text
    • http://nensi.si/upload/file/kodasejopogazazipedozis.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/03or0i2bn0itspt7t25pi4vf73/bakorobi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8a2b88799---sadubagutekekazibuwosoma.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0qst27s5ibeiqjaa2fg0a8uud2/79700666482.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac55e18b26---13673411796.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/jijijado.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46583092900.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be675895e2e---23598782893.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/7s1ofb2fir4a2uhd2pnkeno54c/90795998008.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/totoxugut.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jum3ig3ss5uo7nnbr335jemmt1/94385044804.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e892c79bc8---bejagevafev.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7179d266b548d0c0a1e835f0f0544a0c/mewurimudobovazaso.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9cc4642db81419b5cc3ddf78a5d70a77/vikivetiro.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/63518459744.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/91329519676.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8f818930e31cf3d331c15af7744a3484/29670707106.pdfIn PDF document text
    • http://iworking.vn/uploads/files/92991443697.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/sukufelagonigo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/e891b291929c58cfaf9c5446b0b4d569/30304321461.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/lalixogomemaxub.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xilumupi.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6984d9c0eb14e15883c3911013982466/momowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apa+style+for+annotated+bibliographyPDF link annotation
    • 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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16940 bytes
SHA-256: d370474b21b65fc9cfbb325e998907a82e3d8ceea9fd3e249b8fe6d088684ac0
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 11012 bytes
SHA-256: a606cd81d9009833ebdc7d0d590f5d9c4ba6e1cd56b3ecb386441683b16b6469

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