Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ea6e0f9ed1a3d2…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 19:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 416151dc8d218fb26bd0b47b6fd7cf68 SHA-1: 83f1157c4bbf7b305067358a6d4a2e089762685b SHA-256: 43ea6e0f9ed1a3d227609830b7105ee3dc91f07d94d66122c64afd4c8cd1d47f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://planetamama.ru/files/file/vurezolotalinenalaralu.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/697c4f450e95d8c9c281106e79a38d8a/vopipakujafuzakixanun.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/841979277dc055be266a7a318d736781/wajapadu.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f785b524e526c042ad9ff6adca8860a4/funukulezeweke.pdf
    • http://www.findvoters.com/userfiles/file/21721254938.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c522465f3---boxupuxuwijopipoziset.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8cbc2f668---nefigepedefitedusiwega.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160982b63a823e---79516296899.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6de820d8---34481401527.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fcc3cd2d0685d1b8a6e67a8addd5cc5/rusanizavobubuwunim.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/87672141843.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e0c501fe280fd6c9935b3b657ab8e90/63133349176.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1db37183---39704577991.pdf
    • http://guchenes.com/d/files/71006617757.pdf
    • https://accu-split.com/userfiles/files/lizititanovutidex.pdf
    • https://dienlanhhonganh.com/images/pic/file/magazudesesap.pdf
    • http://iseveranscopy.com/upload/editor/file/48184814590.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a8099cff19b23296ae70236ffe636b0/pagimosodisuwex.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0810d11bd---77616559181.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/59249576209.pdf
    • http://liffeyartefacts.com/fckimagefile/file/zasitepemotalixesogibip.pdf
    • https://espiber.cl/images/uploadedimages/file/75131930245.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee542b53---56742406482.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9beac931---78354758535.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+pt+in+gallon
    • 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_off0000ee27.bin
3ed9fe12e93eb413d1fe38e606718ac7e74ed48ff8aa9de7e1aa10964774dcc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10388 bytes
font_01_sfnt_off000105a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 16792 bytes
font_02_sfnt_off00011db2.bin
3fcec4a84c860994f57907cfd58c93e448aedd47c4c89066272106fb79951ddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 17116 bytes