Malicious PDF — malware analysis report

Static analysis result for SHA-256 609db1cb80ddeb3c…

MALICIOUS

PDF

92.3 KB Created: 2021-06-26 10:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb2ae6a5fd1f1ee306e04aafd7136f7e SHA-1: d3d97bfe0ff2fdf94b9e2ab3979bc5a8af4fffe9 SHA-256: 609db1cb80ddeb3c317c7ed199af5795ff909f6da7983b49b1ea31390168bdcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links pointing to compromised WordPress sites, many of which host PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61771d658---89939595764.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a4c87c338---76695428347.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091683bbb065---muxifowumeriduwif.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a39779d15---85529685005.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03cae9e7a---65738794595.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074435553c87---71355551136.pdf
    • http://wtmongolia.com/materials/file/bexugonetimizol.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/20994350609.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/v5or9vs6vnlitj7ec14q05ts81/88536596461.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/33dfa3d0f001cdae4dff61372e8e728d/pumalitofarujat.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/686864d1f88abc4760cf9eda7be68cb5/buteripuzi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160965e959e530---49643035587.pdf
    • http://lezeckastenakosice.sk/upload/files/62431654900.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/78c67157fe9d771b88c346355e542b3b/47685034167.pdf
    • https://daaeportrett.no/upload/file/bomoxopexofukesixibeg.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf9bc9959---22889286749.pdf
    • http://gshosnab.ru/userfiles/file/3112092691.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/supobebajuwekubuse.pdf
    • https://ahreco.com/uploads/news_file/85863892509.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096782e3862f---gewadikiguxag.pdf
    • http://metabolit-plus.ru/files/file/wamegozurebitaluruva.pdf
    • http://axiomestates.com/userfiles/file/nesuserufekojo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6ma2dmsjbesreg29bb4gi1i942/pigejix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=journey+by+night+class+9+questions+and+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeab.bin
5f301be76b0dc111ee9d74014720ca3703783bfe88bde83b807a540effece21f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11396 bytes
font_01_sfnt_off00010915.bin
c81b5f7c8d8dd3539db09cf9d60fc7e42bc88e781ad8fe7e4a90b7ef41e11324
pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 17148 bytes
font_02_sfnt_off0001361e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 16792 bytes
font_03_sfnt_off00014e2f.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2F 16088 bytes