Malicious PDF — malware analysis report

Static analysis result for SHA-256 093cfed178bbb2a5…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 00:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 777d3d7b034829b193107a24ea6f2adf SHA-1: 1b65fb73646713162caf196314793eca5839cef6 SHA-256: 093cfed178bbb2a5ba0174787de3ac080fcb2ed3c2f9c8ec4063a288abb7c57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=dt+quick+crossword+answers
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/437df8048b369f9c12040c0618854cb5/gawamorux.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713020360a6---fovodavofigodiza.pdf
    • https://aartipalette.com/userfiles/file/rewepajobepumeke.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28d950e1e---1265971769.pdf
    • http://champaigncursillo.com/userfiles/file/noxotufu.pdf
    • http://studiogallerani.it/userfiles/files/xidegagexaguvodogig.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ce38be68816577b2e23efa433a30c242/golaveret.pdf
    • http://nicenpos.com/userData/board/file/880167286.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c87f8d5410c16c58832dad0af037df4a/pizupuxuzitavo.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e2a0c7a9---perekawapefu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160781eab78b61---24138677447.pdf
    • http://bhhangkhong.com/upload/images/files/gebalarozap.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/935327325cd79a05b493f1e419f569fa/pufutifupulalulutosejidi.pdf
    • http://okfilm.kr/userData/board/file/sefuw.pdf
    • https://ludifrance.fr/userfiles/file/wujozapazoga.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/36a1f0c6d1e532becaeec516981c09e1/55088225801.pdf
    • http://activesolutionelectric.com/images/file/getepi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b403803ff---zikoli.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/acabb4925e5f4e5d20b8ef3ee6d7755e/panemobevisozowifif.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078671be7dd0---zizuperagatigameputi.pdf
    • https://signika.pl/Upload/file/dizabuposa.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1ern7ic12hvsk3198bt78jde70/gurenepumatovax.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/efc0ba7bf33a2d9eab721ffac843a189/daxenafaketowudigik.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2b7beb4c7b176970bec5d3d2b1578a3b/30563965852.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ed29437eeb7f506a148ebc79876eed74/69920120244.pdf
    • https://inncredel.com/uploads/65383964389.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_off0000efed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 16792 bytes
font_01_sfnt_off00010804.bin
5be9c3a9901a95771f950b284460ab4614615b67c4e35187b97e7571f6876c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10740 bytes
font_02_sfnt_off000120ba.bin
b289558585215a84e2b18ffb98cc238d66a6815135c6f2ccb29be343c1c8acd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 18000 bytes