Malicious PDF — malware analysis report

Static analysis result for SHA-256 711f193b6d39235c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 19:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: edb691c6016921a8c860682550d2e57f SHA-1: d846103267a1a350feb4958ae25f82ccc25e7f28 SHA-256: 711f193b6d39235c4ea7e77e6c711bf073cf29afc4a503a6eeaa2b7574dccb22
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick the user into running a command, likely to download and execute a secondary payload. Multiple URLs were found, some pointing to compromised WordPress sites, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://yar-net.ru/userfiles/file/75199303361.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ef87d1a6---51165243351.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sexududemu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/19045320353.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vg3mtlgc7pid95kffqn9gl99to/weposiximuvigujesi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e10eb9a95---69592398593.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/97697666619.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/78504178494.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8c07a7764697d08e958b30f50116e633/86703084982.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16128d130e6ce6---watalekifozoxasar.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210816085517.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lekevumoba.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8c659532---60444819282.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/52760348434.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cid2ut0f3qruc6oglnm54f1md5/tamojep.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a703b101f---10541338426.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7614b4efb981747b9f74a4b272d182de/ginebagi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6c67705cb---74327441276.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/30857117109.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/27459162073.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/50119086185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=manual+pinnacle+studio+21+ultimate+espa%C3%B1olPDF link annotation
    • https://lapdonline.org/file/sapesewedigufevemuvexovo.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11044 bytes
SHA-256: 7b781852820dd87024573dc7530ab70d78214bd7a872c52c5813cffef21e9f75
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 19124 bytes
SHA-256: 2c46244fe4a79097f4aaed5aaa12c8039724310ff2521f7bc844c4e00306a763

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