Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e272b1bff77e39…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 23:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 976de4b7367082628834492a7b3322f8 SHA-1: fac438489db483cd0e0d700423f907ba60586a78 SHA-256: 27e272b1bff77e3995093987c5ce7a5420a720bd32f77d6b72c0f3ff0fb793d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zzwgjx.com/d/files/zejopewadazepotigabuzuwif.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe44c6bccfba7bd40310e7f3611135e2/1681759925.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/motetufepulevobavufav.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a83ae8cba---xirizaborusulokozazapi.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/55797547454.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/bopekuwonivijuzufu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/nurogal.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/96507771689.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/puxaretelilutegaz.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/8212040022.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/kexopotelopopugisej.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea8302333d7f5af8fdde7d63f927e36d/nugezefure.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/54121685805.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b4336a04---51184108996.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/rodorovudimirasoxolitu.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/99573179133.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7ajmpqdh7me73fojj9t6nkpp7o/7432188821.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/mitubiten.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f6116139---32311915815.pdfIn PDF document text
    • https://actor-conseil.com/files/file/17774057579.pdfIn PDF document text
    • https://italvaping.com/file/6094738655.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/c797tg6kkqmd9h8jukr9grvckj/6702212039.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/50cc623630f586ab177c9514b6e99a93/sidujafirenatejetusit.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81146fa66---visikugimopudifiram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fostex+6301bx+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5c68585e88b76ca12f1537a686eaee02/52444334502.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_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 18036 bytes
SHA-256: b48d75cfd3c4e2b4d88c60edf2235341362a44e637013e4939398f9b0796238e
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 10912 bytes
SHA-256: 1742376d58fb9d481211c4b15de59e7a3ff4829d84befecb781ad2c02cdd3c13