Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82d14e5c3dcd247…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 15:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e1ad73ac1c295a4d1fe710aa495b48e SHA-1: 00c43436c04695ad7f350a41c9886a3fa565eb6e SHA-256: e82d14e5c3dcd24741f5b64426dd44642ae64c738b84316a5621b716fbd4222f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm heuristics point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=what+does+the+yellow+heart+mean+on+snapchat
    • https://behagi.eus/files/galeria/files/41409535983.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/79502325000.pdf
    • http://df-2.de/images/daten/file/12509271144.pdf
    • http://scheiden-maassluis.nl/uploads//file/27269548202.pdf
    • https://jagamimpi.com/contents//files/pojog.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a08umkbt7lcq68dtm977qfms44/wofalokutikeliwebajaji.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/58905744782.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/118bc5bca7754b30d5b96c1857baa5b0/76176647200.pdf
    • http://hodinovysoused.cz/upload/file/lereseforigowibabiman.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a64471d22---bopizurawenijabajagafiv.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af01d9e6b17---poralix.pdf
    • http://okmarin.ru/userfiles/file/68078671446.pdf
    • https://ferado.vn/userfiles/file/vutolis.pdf
    • https://canevastoilestjean.com/upload/editor/file/91554641519.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c199e743f3---21699831373.pdf
    • https://pet-fashion.ro/mm/file/12310691498.pdf
    • https://preprodpcb.com/userfiles/files/bopilik.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/78066699050.pdf
    • https://bandai-k.com/userfiles/file/67851802791.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zuven.pdf
    • http://etcad.net/np/upfile/file/36002374608.pdf
    • http://codienlanhminhquang.com/upload/files/dilusituwajusulikitizufub.pdf
    • https://windsbs.biz/files/file/60721549231.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/7034858334.pdf
    • http://myqself.com/upload/files/dugasigojagi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16792 bytes
font_01_sfnt_off00010433.bin
7248f7cdfa47b6b25bd6ca61817e33ac209d40faa602fefaf966a49f67bb864b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 17036 bytes
font_02_sfnt_off00013096.bin
3b901691f681085249bfae57eb5ec11535a5bbde5952d0e067f8e99559ac6f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 10880 bytes