Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf926b94d0069dcf…

MALICIOUS

PDF

107.0 KB Created: 2021-09-06 10:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afb73febfe1dc51eb8886c9ffb5bcca8 SHA-1: b786cf70c65f75962178aaf6fd7e668d04c9893e SHA-256: cf926b94d0069dcf99d6138afd7bef30d4da1f9f9ff397b1750eb7835ebcaa8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pmqe80f74qtblpt9qvd12s4kms/68734453227.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/8648603153.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/jutuxa.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/643ebe98161e19e15a4fb6161e133e41/44432417826.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/tewugel.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/41t082ujvidunk9nohf4pcdask/27726285554.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rm28asvg0jhou4gmhq69ev42q3/14823755292.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/65427219411.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc9965a1c---86983140375.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/13715005270.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/pupokamesadulewodoti.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/30995508220.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/45050956619.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/goretubeperelemokamuboza.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/56877919183.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/29ba705f149161effd9406053a3ee8de/83892943671.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/nivuvegetakotepumelojinaw.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/917358c9a5c1b1bc5c8104aa53aaf5df/58653436288.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa1c3f501---jamalulela.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609751d398594---52013698571.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/devabufisizegavoxuxazebit.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e01c9cd7c---52869840758.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160721922b44fe---3163927636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fault+lines+book+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_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 19348 bytes
SHA-256: 699ed80aa5041c8411842fafea2a0079638d08a6555e50b0666274c3247afe4b
font_01_sfnt_off00016df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF3 10700 bytes
SHA-256: cbf54e60af3ece286692d62cd5cc313048eecf5450aea57485eec70fbb712543
font_02_sfnt_off00018663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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