Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdeb0f8e72d1732…

MALICIOUS

PDF

145.8 KB Created: 2021-07-16 10:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3083ac1c35388784cf348614b321e439 SHA-1: 3f07aeb39d518e0ae9360b84d43d70b662a9e46d SHA-256: 0cdeb0f8e72d17324c2d940ae7c5d9102a1a5bc8045dec92a173b14dccf7d1e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://synerhu.ru/uplcv?utm_term=greek+stories+and+myths PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rfocioqsf7j2hf0rh64v8770v1/modisajivimideratezexexo.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/92074941910.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zuwuxajijedosab.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bozigomenedamobixamob.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/bhhiderd4iim86rkifpcndtb2s/ruruxefu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/toviwomanapezevapo.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/f104a3bc551ce531fd0b4b9338ac1b99/74022386724.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/89338422955.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/70572997722.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/5785560437.pdfIn PDF document text
    • https://iword.de/userfiles/file/26795946294.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nuzivubovipusanodenazi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8608cb983---68311115467.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51f31a16974f0bbe9f3f758a6a49ba0d/nazawilop.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jomijipovasotinepa.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/mitetisovujofefikerefo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/384925046578219003d808943c398e5a/71989298778.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e5510bcf---fipejekosawol.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2124f310e6---verikatolelupijag.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/71113847901.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/luvowopu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160817164072e6---53713068139.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1dkn0098m09d2i3sap665njor5/wowevujukalem.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1243d7167---19007715824.pdfIn PDF document text
    • 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_off0001d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC7E 10712 bytes
SHA-256: 81521f35ce627af03df8eb796996ab49fe97067f84c94642a3851b51b2d943c6
font_02_sfnt_off000204fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204FC 20128 bytes
SHA-256: dc250be7b6c9fc1678e7de5baf4e85526328a260f389058c312e35342413fdf8

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