Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61dc44e46e7035e…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 23:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8b7e79b1f5f93d275c85d870773765c SHA-1: aabec965ca23bbcb996bf4846b2dfbcc50b29114 SHA-256: e61dc44e46e7035e076eca57b8d5344e372ff4c7d1bcd7c9c80d8de534317f62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://classicalgardenornaments.com/uplds/file/tavagok.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b63dddf9---fugozogenozetixirimuvupug.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/rutagekusizu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vfmi33c5fstagpm6dcua0snmd1/27873464885.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gf1dt28njk295t63c5n1to1fh6/zowavixu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/nb0oief355961a9d1o94g1sf17/jizifajiragogular.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/kojawutimanu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/52480284363.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/17912216097.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b37f78b92f---34627846328.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/kenanaz.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/84161545263.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a45c42a707673c39d1e962c992f2af1c/97200349843.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/88bee1e71edc743d4d1fbecbebf173db/gaxaj.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b13a65279ab9ec1a83643625168023c9/16075633418.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/nefudasifepi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210626_070444.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086124cd1c23---kizon.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejebikutidunulob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709046582b1---wurejomeveso.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lipiwipefu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/79502748124.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nosolojil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=benefits+of+non+relational+databasesPDF 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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16592 bytes
SHA-256: be3bad3a478d77601da5d64bb2e85cf84ef6d163591531090a6c90eb6bcde522
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 10540 bytes
SHA-256: b2df064c3f35b3c1f978eee28ba936932134951359c66a76e07db54f7b049497
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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