Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df29d0859fcc54c…

MALICIOUS

PDF

74.1 KB Created: 2021-10-07 03:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79c68d65ddacb42b5166b6b249cb034b SHA-1: 812d6693a257ee86d65b9fa56ef3e9e2e46081f1 SHA-256: 3df29d0859fcc54c6b19cf3a8c519d668a8468bbe7e782f753310061d0d67fa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be disposable or compromised, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://sochi-polyana.com/ckfinder/userfiles/files/jopap.pdf In PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/39266970676.pdfIn PDF document text
    • http://rpelektromont.cz/admin/obrazky/file/74160539120.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/92806890.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17501144594.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/28829383420.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sikosugulodofomiraxilotu.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/885e051a38d0b32f67d881ee2cb6a80a/20642152363.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1309697917614c2dd02d9cb.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/69092579100.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159e21fb07bc---kulaxaxa.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/wojavigalikobuzazeripon.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/xubowosakufujeg.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/gikejawukonadujepesoku.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vpm30uanj5omkigg52i4ffokg2/26784859800.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/73670127848.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210908020501_y730f0.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/zepulijejezor.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/4863377064.pdfIn PDF document text
    • https://granitnet.hu/editor_up/52469282239.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/zasejezizawaxiwawozuvusi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444cc55651a---1446719541.pdfIn PDF document text
    • http://sns.hu/_user/file/37691882929.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/munoputifebemoxipogulilop.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/iif6qnck7acd2h6f20l485517a/41335550013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kung+fu+meaning+in+englishPDF 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 10436 bytes
SHA-256: c192c9d64b924a8d19a53584688f38c5851d25f04a6d42d3d54be8d62542e8c4
font_01_sfnt_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 18360 bytes
SHA-256: bb9ea810e716b6ae38a4d014fdc2d68d2b7cc40a8c8fba15b8f533ba51925ec9
font_02_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1