Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdd3b79f1cb48dd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 13:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 062be8051e707335674b2649c0506109 SHA-1: bc102736f6b62ce95ef3cd49a94e7c5e2d773198 SHA-256: 3fdd3b79f1cb48dd0ada4a0f42b2f7ccf7aee9ad38e357e8b23a7fe74c98cb7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to link farms hosted on compromised WordPress sites, which in turn host other PDF files. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, and the link farm structure is a common tactic for phishing or distributing malware. The primary attack pattern involves luring users through a series of redirects to ultimately deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=free+teaching+cursive+writing+worksheets PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4oua9cehg97vs8hqife9u431g3/pitajuzapumunadisa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/tasivililupon.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b855a0ed39280db3fd8e55b9d7ea3558/56061039259.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/vomikepeninazofeno.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/kabavoxisalubekutufop.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c3e9171da0110b6fdd6187731e86e413/mepedunagigiwo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eteoduml83rcnvrskktf4ofjkc/98403895313.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/zipomuzipikawutewixina.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/71675387346.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b3d08a4f---wumiwopabopisuvawana.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/40650418851.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/siwivejiboxawenufejete.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dd3d75ba02419f0ac3c3b9a2c5272ed7/33629468923.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f35c96cc572929f688295081891035c1/8446487434.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/15a0cff1be282deaeabc870c973fca70/20520051936.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210825034630.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/kubup.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/5755115155.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/pigidilopobanimilurun.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/96848192613.pdfIn PDF document text
    • http://robbes.nl/media/files/13369566517.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/59732810972.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/15184706515.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lolul.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/badakoru.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 17808 bytes
SHA-256: a1bb54154fed7947edd7ccbd5978c9041df54e5df8b9740ff1f753068e101701
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 10784 bytes
SHA-256: ac0f1b8c10ffe1415794462be7bb72a1be206143af2c19c263765865290e0d45

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