Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e5ac679f3d1203…

MALICIOUS

PDF

68.1 KB Created: 2021-09-17 02:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f5ae6a8108fbc8ee6697ea93b77eed7 SHA-1: 10c34810bdf3c11f520e34aa8805efd1de6a1b3a SHA-256: d5e5ac679f3d12033e00bdfea396e0f897bb82daa1a8be744b13857e5bc8d67a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=formula+for+finding+arc+of+a+circle PDF link annotation
    • http://facilitymanagementassociates.com/survey/userfiles/files/zipofipokimi.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/likotuvu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48bc092a0---83543861611.pdfIn PDF document text
    • http://taociren.com/upload/file/2109111655521641262nfrb899a69r.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/52590805315.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/dopafasajago.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/sisetafafeluroxobakivup.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bojatugowogixige.pdfIn PDF document text
    • http://www.pilartangguh.com/file/38232102122.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/21312488276.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/25191790323.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/faperanemoruforanom.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c21f44433---85253478597.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/48123366663.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d01e4361130abab602b1a71731597710/wivamomilukemal.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/zewosadubirojovademaf.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2e81d22a721c1f5e13e62d6652204e32/gujewalero.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/dasegipuvibiwareba.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/94024754336.pdfIn PDF document text
    • https://red-adlay.com/upload/files/sisosizawamowar.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda1b874ab---73914100991.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/durezugiwelimefeveperok.pdfIn PDF document text
    • http://starma.pl/files/file/64318771662.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_off0000afba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 14212 bytes
SHA-256: ae32af52319faa9581e6a9a20c6810340bb417160d0920ec7e40ce2a92b55d7d
font_02_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10632 bytes
SHA-256: fe0ac55ae32806cb1498812cc525100ed4b27e58301bbe42832e4dcf2fee2402

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