Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4258c5bf0e6725…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 23:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f35cb7e8037feb3d28d9d52afab69dc7 SHA-1: 101866ba74fe630e1d2c1089b740c51366fda227 SHA-256: 2f4258c5bf0e6725b787b0f3f7384025efb8229f0cf4bd4912c902864fdb2bd3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1553.005 Security Software Bypass

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that likely lead to phishing or malware download sites, forming a link farm. Notably, the document includes an instruction to disable security software, a high-risk indicator for malicious intent. No scripts were extracted, but the overall pattern suggests a malicious document designed to bypass security and lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=there+was+a+problem+parsing+the+package+pubg PDF link annotation
    • http://udelimpa.es/ckfinder/userfiles/files/41078248382.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adc4907ff3---23185071004.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/dinevatalawefagogifubejo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad69b10a---67651849374.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/33174035247.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/53216712481.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/gebinetogapamurerekimofa.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/21795285119.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/28083447701.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/lizumaxipusol.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2fgie761533gq2uffjem8p43ug/90758210248.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/46884300854.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/wizujaduruduridavobir.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/15915202630.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/64226618105.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/48640553935.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904055102293119.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/86317051848.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/51287222775.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/reguzemiwororinamelobube.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/82633205355.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27543100639.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/19680165941.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/68669683615.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/41623083299.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 17420 bytes
SHA-256: 64bc8abaadf0101ad4a7a9565124eaeb193b91989504c872ef97acb3a36d3b0a
font_01_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 11200 bytes
SHA-256: 85206824763bd2170d701998a945649992a184c140b05e2ea82a54a05d800861
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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