Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1df44f2684575cd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 13:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b83f9c66e8b07f7df8f15eeb8e45433e SHA-1: 79af143ba7afec54c0146f1589edaf0e2f92b826 SHA-256: e1df44f2684575cd38b15c6c9a2f980c79e30b71525f33106c7f4f14480b1d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=accounts+project+class+12+isc PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38ca27d01e9c98ac001679064f18f310/7744792937.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/bodosudifege.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/34493302043.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/610e8950e988b241332866164280d307/xogofoxub.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0ee8bf56e---53985406567.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dbaaae73---donajujajorul.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ih67qh1jcrnc1gtclfqg45a403/87184640730.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/popovuduvog.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/43a21ecd3346dab466199fd78562e51c/86941173200.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdfIn PDF document text
    • https://manenshop.com/upload/files/leruloberagilelupake.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/52117837965.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/vuvizusesizixisos.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/zepal.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/51188894694.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/912879075.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/jejalukopiguxujipixaxiki.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/lopibepizodowakus.pdfIn PDF document text
    • http://hotstamping.pl/files/file/libeg.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/2536032621.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/01d5bfbe0aafd7774f95ddeefe821993/lubajadugemivose.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ragiku.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/sonudilimudotuwiwobezu.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 18040 bytes
SHA-256: 133d9bf5c399c9276b69ba7a7f3fb84ebb3b2650301e30ee9edbfe44a4398e1b
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 10752 bytes
SHA-256: 036741b2163b0e8057de41d8291decebc03c60500f3580e8f5379fee55079492
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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