Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb86460a03fe492…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 05:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0b79f46471097a635dd85d3d89307b6 SHA-1: b78d5231704fbef8ed3aad255d7ee79e99e14935 SHA-256: dbb86460a03fe4924b9f4b3338534ef46a4092513b4b72c2685af99c1b00a85d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/77a958d50209c0510e43d2214eeb217e/76874921679.pdf In PDF document text
    • http://xingyeknitting.com/userfiles/files/24758211919.pdfIn PDF document text
    • http://generoussecurity.com/uploads/22463427621.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/luruzaduriruragukux.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/85777776612.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/37439113407.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/147913571360e4192eda5b3.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/mudurijadamiwi.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/53393215097.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b179840611ff1eaca8b488ceaea0ae7/robopevefevixonujur.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8cbab1f2d---20225522134.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/14981549311.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4f6e31c20b507cfb101b829e3834ea15/92517211852.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wovijuvitijujozabezabit.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b77f78ec83---sasapafolivanigo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/48584853437.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/5684124989.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/zegaxupinemupigusi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1b48cadd664a0c4b43feec64e3a621a/55831625704.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o724ibcalhlnrl71bh2puu6eg7/97085386692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manualidades+para+navidad+2019+paso+a+pasoPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nefurebeliwonugovuxunadim.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_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 17188 bytes
SHA-256: 80e7648b4c04e959a6e165bd6c96135f1468aaa143bd33f8e9d7ac6dfe365c7b
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 10908 bytes
SHA-256: a5b3b16910ef959c6dade857c1667df35dc5e55bd460ffb93dadcd32a63b6110

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