Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9e4a353de6bf90…

MALICIOUS

PDF

90.4 KB Created: 2021-07-02 15:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a8e9d96a009b154d9bf20e229acb9bd SHA-1: f466f2bd8346e563bbb861d3841474af76636b0e SHA-256: 7c9e4a353de6bf9067ca039941504530ed25f659016eb7dc6937b0b1a97890a7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crewmak.ru/uplcv?utm_term=harry+potter+theme+piano+notes+letters
    • http://lnianemarzenie.pl/userfiles/file/wuvofewuzenawifuxix.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/89a259fd7165d7099ee524a6067c23ff/19555979367.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5fl5c3hc8jl4rrsoip8ug6v734/43842013914.pdf
    • https://appvid.eus/userfiles/files/gobaxejojimesudulinofek.pdf
    • http://marthomaiticherukole.com/userfiles/file/nibexititufipadiworojof.pdf
    • http://china-engine.net/ckfinder/userfiles/files/20729876528.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53c137c02b8b26489899a6f985ac6d47/vosuso.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbae9ed643eab87d41dbeac381cce3e/31519824758.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c4e370b8dc2e1799396de6af557e9e57/90232824669.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/falemesufapuraduxudom.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5ple36p90snetm32476dj6l0l5/mekifen.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cefce4d3db55054bedefc5113f04d306/wijupubuxurupovofi.pdf
    • http://ahchala.com/img/file/22803035706.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c2167ea2---kakilisiz.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4879329a78---vuzemewoledosuditinu.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/madazekon.pdf
    • http://ackerviewguesthouse.com/userfiles/file/39222913351.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4ad35007b3d2e5c1376b9c19618fa6b/95196074031.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/66583782334.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8076c35e---dasikivojuxulazepul.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac786bc4f---zaduvafefaribifimex.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b8f5ddb0cf1e877586df15e86ced68d/vonipov.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/cb0a5f285b4db20395d9792fe0838f95/38158439462.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e2a76c86---kadug.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160743bb20e684---49117793090.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c3.bin
980dfe31ea41385285552d055b7bfa60cb69b28776f4bd743773d506775b58fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 18048 bytes
font_01_sfnt_off0001147a.bin
822b21c5ea4d69f4f7d9d50f13df288f2c3e73a10368c59417b252e996b1b46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 16528 bytes
font_02_sfnt_off00012b7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 16792 bytes
font_03_sfnt_off00014394.bin
5b793cb3b83b94d1510f009945aa8e1def72b264f51dae9c826986e849e3882a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14394 10624 bytes

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