Malicious PDF — malware analysis report

Static analysis result for SHA-256 f161378562f9ff6d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 06:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b9c16da19bc94cc9533ce09dc11819a SHA-1: aeb1c0d1ea4fac43324f4872d0b949cf6bacda4c SHA-256: f161378562f9ff6d6978a3777d340c18813031037daa85d428ceceb2ce0cdbe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b910af5c046---puvopodilepezaf.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e71f81bf7---gazotinug.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/tunav.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/gasuvobifate.pdfIn PDF document text
    • http://abc-tel.ru/data/File/91977892546.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bulibelejuk.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fodiridimafonijat.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/aj0ae9100k1ta2l0m63sacqicn/sowugabafetudo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/ritewamonijakometif.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8d3740a9---rijedasonaritokurexexaz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f688cab672---89798651432.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a5a7d7a8---wibibezi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/grsj0phlct6ee02dfecdf6deq4/4883494604.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/30ccafc748e4f7cbfdb16219c5bc66c2/98360408932.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/31001547151.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/marofebajaligejunopape.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b1nbkpgov6vjro6asc433gtk1f/muwoludiwi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/vigikizunozikudiwaf.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/66327542264.pdfIn PDF document text
    • http://erex.hu/upload/file/61320136269.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/27787266005.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/u74h3p32oivbi19p7d6cau5g97/wopiriteguxarivi.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/lolibenuvogizukafakun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+transitive+verb+pdfPDF link annotation
    • 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_off0000bd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD23 10628 bytes
SHA-256: 59096b49e5c86e2316b74f65d692418490d99f9bff33820e324eb2886ad4eac1
font_01_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 15608 bytes
SHA-256: db34635d28f71e75e0a88b52f3c27b9ab735b8747e8efbe8c55c46668d1fa5ca

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