Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f801f032b8dd28…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 21:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e23c5f0eeed265ba990458936383c1d6 SHA-1: 98da531377797320aebca7d5d45a85c716e1aca9 SHA-256: e0f801f032b8dd28c694a936438896c29cf1faf37ab7e4e91a3f4e6c78ff5f96
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to external sites, many hosted on domains associated with compromised CMS uploads or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such domains for link distribution, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ec9b14b6---lipumovixatafujito.pdf In PDF document text
    • https://cytokin.ca/upload/editor/file/vuxaxofivawamovuvesumok.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/9170769860.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/83281786225.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c22a5c39661197c0d394491cfafc86a9/suxuzewamo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf28bca5285---60019451212.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/57cte8m1aqgfmuciouo2tf6620/66058077683.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/75488870712.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2er3fi6t10lrdt4ghg7hqi2jrs/52815137029.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/pexududomireriz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc8a4042f---tunemademiwabotitan.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee23b8f4c83c64b6c29355c9c69253b2/27602476573.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc738c1b5e8---natesixidoravukenidanari.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/zadokamutur.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/50334700478.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/45872f64036f89a8e541902b02e295d6/21386684088.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/62790608587.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/22319350740.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160987acc68525---dogajaf.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/80989258836.pdfIn PDF document text
    • https://advik.net/userfiles/file/34547908644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=match+the+pictures+with+alphabets+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 16296 bytes
SHA-256: dacb6971998b77fee5072c631a1dc5a7ab591f7e6474f0af4b3cb4ff44430450
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 10812 bytes
SHA-256: 55350384a1161be9c480373f8ab414c2352ff14cf8de3e467b991657b5249506

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