Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fad0ec68a4f718…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f74f17993966e094a44d8f23c19dce09 SHA-1: 80075abf38c76386d8063c165cec30dda20090ee SHA-256: 92fad0ec68a4f71854ec507041c9fd20a747354bde3781f9ee0449e2ec21ff53
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and the nature of the linked URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc79ce60d---fipekinipimeku.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089febc1c8e9---lupagomiwurezupudon.pdf
    • http://whewfamily.com/clients/12004/File/83000813658.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/15800914105.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jb9ghk12sm06r7863oksmhveq1/bukixabubugemibavixuva.pdf
    • http://wagnerpc.com/userfiles/files/filavosobigazajoweg.pdf
    • https://cgeminfos.ma/upload/file/14302500000.pdf
    • http://veterinariomauracotti.it/userfiles/files/koxetikozevugapusar.pdf
    • http://muzeumostrowiec.pl/obrazy/file/24869701228.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4eebfb821ea7ef9ea8e90652f1e6e59d/2923332776.pdf
    • http://robertoantoniz.com/resources/original/file/mifajijepake.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c4e350e0219718f5dc058120fd9f685e/6359675090.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c507d8f2689---lokibiniluxerofetitufude.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3b2d4f564e321649b78483524adb89e2/57244562667.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd28b0edca---xemokoluxeli.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210620_180440.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23b11cc53---92394957991.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42dd2d367---64834687122.pdf
    • http://supermarketdv.ru/files/file/68672806433.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ee80a97b1d13f2ef91357a5d1141c632/15720736067.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6989e171b725849d827abd0f9a8cc42d/293450755.pdf
    • http://kalikraft.com/images/file/33199659830.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70121a4778---nugirurotikoxiwujefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rose+are+violets+are+blue+poems
    • 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_off0000f7ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 16792 bytes
font_01_sfnt_off00010fc5.bin
6cf8d63378ecfeacbc987e3671078b3d5b55e138692a62f50225b29b8c529fb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10660 bytes
font_02_sfnt_off000127ff.bin
76c800be114f76dc03c29af3d6ae682749746c41f2d50dbf33543b7d7e0ea5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 18804 bytes