Malicious PDF — malware analysis report

Static analysis result for SHA-256 866cad0b4bbfd09c…

MALICIOUS

PDF

130.5 KB Created: 2021-06-28 08:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fefa918beeb2ba2d0da0cdec3f4c214a SHA-1: b1f1c33679ba0c3a6e8934f6b49888d6f6bbb80d SHA-256: 866cad0b4bbfd09cc9d1c7f0d2912e80677f43b63e690897b6026b52a2196880
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. The document body is unreadable, but the heuristics indicate a lure mechanism, likely to trick users into downloading malicious content. No scripts were extracted, but the presence of numerous links to potentially malicious PDFs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f43ddaee7---dijexiwigimitoveje.pdf In PDF document text
    • http://sneedfamilyct.com/clients/44919/File/85496611608.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a503f980ba3---53497423710.pdfIn PDF document text
    • http://ahchala.com/img/file/53915356427.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/5016031618.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084abd16532b---65740240387.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dcc6e51d5d1270a01bf354cd89fe78bb/35131632152.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609401f8e88bb---59328987515.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6eadef771ba783c66e930070d120221d/xelonefitefiw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a193e162a85---92104107917.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b49c824561cbceffeff3ec4badc97174/jutokedome.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l04boobjjee1qacpk47es5jm9c/kavemamoxagufezu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/512t4lnci1vmn1ocosq7acgvcp/36775238085.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b82dbb64---kozologalesuf.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a100b3ceb26---2339222926.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a8d1e2b0e6e96d54e7d80a6c14c2dad5/powowesapamejamuletuwu.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/46816988618.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce30131da6a---94801198457.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/24087342129.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/64463629462.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/8857167723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=borderlands+2+female+charactersPDF link annotation
    • 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_off00019cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CAD 17836 bytes
SHA-256: a8d636b39230e9a7af42f61db3b5c728d84a1844fd7d67bdd0cafb6eb30bba7b
font_01_sfnt_off0001cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3C2 10820 bytes
SHA-256: 9c75ba9b774f7621b5cef1df5926dd013b32a181ee8c60b7862abf25ea803b67

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