Malicious PDF — malware analysis report

Static analysis result for SHA-256 12afaf64769591b1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-03 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd4c089afe65084de18e5d00b1156f00 SHA-1: 1e008d6d6baabd8ebbfd8a01a9b490c89967f9c1 SHA-256: 12afaf64769591b137adee679727fc10af26b9e9dadab319c613a63b1915c647
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, including compromised WordPress upload directories. The presence of these links suggests the document is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=perpendicular+bisector+of+a+line+segment+worksheet+pdf PDF link annotation
    • https://rajaunited.com/contents//files/46379665122.pdfIn PDF document text
    • http://climtech.com/files/files/katikef.pdfIn PDF document text
    • http://ciskmv.com/css/file/mijujunuluz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe168e06f---98334789407.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880c33f0ef---nufajurefizapefununalam.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b28dd72f70---15494114775.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f090bbe4ea5---nelokizosipu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c099bbddf32---lawipovapomidedudigaguk.pdfIn PDF document text
    • https://domilot.com/uploader/files/23851758248.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ff3d4cb7c---migelu.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck//file/42959963847.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kaxodijozog.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9e6970085c643ff7aaf3b791a2615dca/50037964852.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1990528b---11104490251.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/79586913910.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5cd8d94b3332a1049ded76404b200254/99497872783.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/37559964797.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/xubesiduforofuzigori.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/mamemisubasuputisijat.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/872d627169936ca7e66d07261561ae89/37745743043.pdfIn PDF document text
    • http://philboyd.com/gexigufimamosevoj.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/36630750505.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qcdl3durti87g3g52hpuuls39i/18606095.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/89987662683.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/rupobija.pdfIn PDF document text
    • http://chikatere.com/Upload/files/87920362582.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_off0000b4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 14168 bytes
SHA-256: 66c3c612b43f14c81acc23ed2fb78c7b0933a65c244f088056a78fd34d77f1da
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 11484 bytes
SHA-256: d135bce14cb76e4ebb26ece3e40d8246f6afc1e0ce07b70317efe51daaab7784

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