Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f84d11b4bd8e94…

MALICIOUS

PDF

105.7 KB Created: 2021-07-15 23:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8e2e48d6125038eaa941382ac72bfc6 SHA-1: 4c642ae56ec3b00f8cf55923946975b18de01dd9 SHA-256: d4f84d11b4bd8e943d40a617bd0617a230dc7f2e1c75545eaf88bef7b92b899b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c990ba40c01---towalusivikibabizajodes.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqqh3u3l4a1bnf32s5ddfj68d1/mitebosamaz.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/pinolafuzuzu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67939ada9---komekegiguvasoj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96017eede1---berewatiragalemuloxetu.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/21666152136.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zivajozagizagag.pdfIn PDF document text
    • https://actor-conseil.com/files/file/fuvefilejodewajofa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160809472470be---gukexuzujubowib.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15cfcfeb6---39119084734.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4a4cd7b5---93808673975.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/66954115522.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/pasomomawotopikekone.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/41667464883.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/23f24762728fc1bf9baaac51dc76a61e/punobavidalumepola.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2a1e13f17d7af7c25fc98c142ef01772/zowimunusod.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/61717720724.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe6cdfe95---suguboluzuf.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ad1ivhnjh6gsqrfbrd6tbb7dpf/92257625975.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac48c17d72---99093668471.pdfIn PDF document text
    • http://peoplefineart.com/assets/202107/files/20210710112530818010.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/73126457398.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/94c2b28def231feea5c207bcf6c09a7d/23171659141.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb764718e19---86523657662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kate+hudson+reese+witherspoonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 10620 bytes
SHA-256: abcdbbd9bcf832b0ad9c8923ef943886eecfdf294fc20687863d470d0da08293
font_03_sfnt_off00016809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16809 18440 bytes
SHA-256: 62342a01df0973b4e25a3de0799d8791908d194b55d23e236cc4cc845744c070

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