Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0da1b7efab9c8e1…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 14:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64240c45b06b017f512f0d4b7cb0dac7 SHA-1: 41a09a4bc267a9e9012ea5e5c660bbd2c04630e1 SHA-256: c0da1b7efab9c8e10d7ccc2289ce355cb27f394f6ed502fcf065d7faa516ce30
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=watch+fifty+shades+of+grey+eng+sub PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372bdf568ac---jalitel.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/6273429368.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/6561869309.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/38976408355.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h9vs18qfgo56tbaod2mcu2adg0/dapidamap.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/14489840022.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210909_200048_4083.pdfIn PDF document text
    • https://websbag.com/uploads/files/vajavove.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/78812937830.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/582a1cba2c667e81c53bbdcd87e2ba26/nolizawibebibijata.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbf467fec---89360394152.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/49893141222.pdfIn PDF document text
    • https://vzglavniki.net/data/file/40911518297.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f431935---kuwidebazezutenerifil.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8acaea4e1642c081f1fce8170054b1c7/1572007124.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/35632585648.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/sizofumesexega.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/27a76f03e863b6b66cf793edb261918e/divuwetexelarigemivona.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/40737685451.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60362164082.pdfIn PDF document text
    • https://vientangluc.com/upload/files/67721243530.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_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 11056 bytes
SHA-256: ac77cd28d1a88f026d455d6649d662b263f13877d00a113afd621034b9400d00
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 17468 bytes
SHA-256: 4dc7ec44107e4c3d20b444fcacce9cbeba1acab9728d5c227fbe9e0b99d1586e
font_02_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1