Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ea81fb605b61d…

MALICIOUS

PDF

85.7 KB Created: 2021-09-24 01:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c71df84b4989ee65a059bc7e1ba122f0 SHA-1: eaec238619e0827c3aacf737377ab8fd131647e7 SHA-256: a39ea81fb605b61d3ef1573c6fd539700ba95d8540ba93e10aa875707f99fbc7
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic indicates the document's content is designed to trick users into believing they are owed a prize or parcel, requiring them to pay a fee. The numerous embedded URLs, many pointing to link farms on disposable hosting, suggest the primary function is to redirect users to malicious sites, likely to further the scam or deliver additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://catamma.ru/uplcv?utm_term=what+are+custom+roms+for+android+phones
    • http://mhzsolutionz.com/userfiles/file/41400037378.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced544c58e---46761349337.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fig2tv5jm5i1qudvgogl4ijlap/revijuwu.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/84554634880.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowitijaxitexaroxaxa.pdf
    • https://atavio.ru/files/file/xalotobumapagaf.pdf
    • http://123podkrovie.sk/editor_uploads/files/fijusalenufakikoxofob.pdf
    • http://www.dean-cpa.com/files/adminpic/file/wanekubugewenegakapom.pdf
    • http://kastely-vacduka.hu/fileok/file/38969323012.pdf
    • http://bodemveenweiden.nl/bodem-veenweiden-img/37133413074.pdf
    • https://ymy-tea.tw/upload/files/xujuniralat.pdf
    • http://nwatchonline.com/userfiles/file/58517764162.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzumipavozupojoludusizob.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210903_62BC4E9F66EB5E2C.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/51261838642.pdf
    • http://cuboni.com/uploadfile/hong202109230153417779.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/noramo.pdf
    • http://1careglobal.com/upload/files/51669597473.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1d9359bf---83382547071.pdf
    • http://akcjonariusz.com/UserFiles/file/25663889262.pdf
    • http://loscogliodifavignana.it/userfiles/files/19254758591.pdf
    • http://roseeskin.com/userfiles/file/20210903015423.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/64033150121.pdf
    • http://forepic.com/_UploadFile/Images/file/zolenilisafojuxorozibajas.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_off0000e942.bin
346569fe40b1352795a0b5baca03ce22ef32562900f7ec465747c401238fa34a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10932 bytes
font_01_sfnt_off00010270.bin
efe5634b71ae56255ce8b8152ba21100b26386c04a66db441b72459ee81e38ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 17656 bytes
font_02_sfnt_off000130b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 16792 bytes