Malicious PDF — malware analysis report

Static analysis result for SHA-256 050458f33e325ac4…

MALICIOUS

PDF

91.7 KB Created: 2021-07-06 16:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9fa55c3c77b315fefc04277a9dab6890 SHA-1: 61fcf0125e2ca272eba42d86ee023fabe3d37bc6 SHA-256: 050458f33e325ac400505db1abb621f172f7ac44ca8213cfb09f5ce5c2469a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=tekken+3+all+players+game+download PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pd1qa50prqgm6udnkp19psuj77/28053793602.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988babfe93---lenoxokuwidemejene.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/985a9a19286e3ffc5a9d544bbd5a64bd/wixobip.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16240569510779.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/pewaxuzixesusu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/85280859111.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d50396122---86949853250.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daf5c727e4d---47839983445.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/rulosuruxagel.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/molazuxebiripizapojusobe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b10650de6---50369857351.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/07054d2065aae3e492de7dc4ac70e44e/61130748242.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/lenoluluxigedaku.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e1eb972e5---96502702679.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/065b5d636866c3a462f791ec9fc6d8cc/48142513500.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/4516022950.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97042d0dc0---1046989435.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/tabukiwukojapi.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tuguzuje.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/vufiw.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/17399658868.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d0e47869---64914602068.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3c0b49bc01246590bab2229319739c58/10003962029.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/da51matdutmarr5becpsg7hom2/67861245500.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b212bfadabe---37908479561.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_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 10972 bytes
SHA-256: 4a0a446c5f46ffbfde5fff0290b6fb36e0d971ff5ba0e5872725bbc2d61c144c
font_01_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 17104 bytes
SHA-256: c21503f2863f3c36b4cab6a6f0ca43077abaa2c4cde0d7bcc33c1bd490f9d732