Malicious PDF — malware analysis report

Static analysis result for SHA-256 f967bf9aad3f2fc1…

MALICIOUS

PDF

108.5 KB Created: 2021-06-26 21:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67cbcd5f9293a0bce8cfbde985028bea SHA-1: 68f3edf6dde3442981f1e5f310c5bff228a0a1c7 SHA-256: f967bf9aad3f2fc127b5af68a96b659618bd935e55815ae04b3266da91fc4c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=chemical+engineering+gate+books+pdf+free+download
    • https://bliznacite.com/files/70669616736.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bb0e44b814136d2666e78b24086c3406/wotumixirubenulepisura.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160838e27406e1---35315795870.pdf
    • http://nextgenship.net/upload/file/20210522162168317768.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70cda69a6---27567503381.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815362ea3---61031268356.pdf
    • http://championshipsportsrings.com/clients/23492/File/27700197029.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b970c9dd88e---91638221460.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cee4320b56c7311134b39e347e8f082f/jobovewefot.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/47571725543.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d2uordivtic4h3lo08mu3i0d77/64683573194.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4c04fc50179824d3c52e997790abcb01/ropudaxezorosupuremakupu.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87a25c2e2---25479640093.pdf
    • http://chono.mn/uploads/userfiles/files/37999403849.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cca9884d7---tumogemesibuvifalizizu.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ce494d72---30789711513.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644ecbb0a1---55352960944.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830891c4b83---zobidudoreziwasewoluzu.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d9b2bd12---fozuzazolezudug.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/djkmc46g38o7g5hljoujtbftfk/62795747915.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pamolilonutobixulode.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0e1e20528---jobumavalebamifaj.pdf
    • http://ascensionchina.com/userfiles/file/duvidamasosivo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f147fbd4---pofifa.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_off00014272.bin
7031dc42eb7fce6a5b8c7b41abb69104098475441727eaed7165b567badd6d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 11416 bytes
font_01_sfnt_off00015cd8.bin
1cb5a60fd2f6ed2383847f246210fcadcac55126f4188928ac73eaf21966c74c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD8 18012 bytes
font_02_sfnt_off00018c53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C53 16792 bytes