Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c2744907b5c237…

MALICIOUS

PDF

82.6 KB Created: 2021-07-07 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e150f9972b7e18371866185acf2de002 SHA-1: 10f782f2b5818b3b61dbc97029ebd97a7175f4a1 SHA-256: 20c2744907b5c23769f937c74399a0d82b63fc7e34ea6216a95fd23cd0e9b31e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5d7bddfe2594de8da16fb2bc5307efe1/48354485577.pdf
    • http://ankurgroups.com/userfiles/file/gujozujikikefilotem.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8ae2914a---xufuwegika.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/zonesabezen.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1vfguo9kta1qju7bs6mg55lgee/48022732506.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06460659---14320749216.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e52711b50df786ffa7102170495727de/80602556928.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/69210c1b641ccd8687b78235d34c2c14/21848511325.pdf
    • http://almar-bus.pl/userfiles/file/nixug.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609483a912fb0---29954772809.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b22eb66a0---96291614640.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de27ea7239---getuxusonolunifogep.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/n2itl8be5tqfjmqaks9i6e81qf/62251986784.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf461378b99---29732283056.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/fa4900c824324d08d9693f6a8158650b/vakujiratefejixu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbbf04b09---tenasinikibo.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/kiveje.pdf
    • http://akcjonariusz.com/UserFiles/file/17714344465.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec053488d9---nepaminisudubiwevapomuvo.pdf
    • http://texmet.pl/userimages/file/teweditefa.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/952fb9e5b8d7d89a14a9e19552d9f969/noxiwipolabibumuse.pdf
    • http://ultraljud.nu/bild/files/nabafimukigetoz.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0797d03ad---telubulumifodo.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076955de8ead---jabizifotidewa.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/md52qprh5c4i7700gucg422so0/25773927811.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b56f076dbe51ffa657151731a70078d0/67757568311.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sunny+and+the+sunglows
    • 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_off0000de44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16792 bytes
font_01_sfnt_off0000f65b.bin
b203ea39c0d0c71076814eb79cda3e3d49a46ac50c6d8ba741e3527c38d7b00a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10712 bytes
font_02_sfnt_off00010ecc.bin
47404bf5d61bb8a6c71fb5a4d00ce976ca6f1f040edd38b246640f400ff3548e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 17316 bytes