Malicious PDF — malware analysis report

Static analysis result for SHA-256 50395b5180e011d7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 22:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64aa34b09f70801d26db60f1397c927a SHA-1: 09604c69f3e14615b919a60bcc2b1223c68b2cdc SHA-256: 50395b5180e011d7273bf5e6a03f9d3acf9b47bdde2ce23b3bd5a8eb71a4549b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2db07982---zifunuxamatewufiridebazu.pdf In PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8757766822e3cd77bdd4db13373111d4/19703414521.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/47f12c5dfb212aa9ba1dc2c5fbf8d6ff/puvov.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2tq4hmoqejv33d455kgu9cn2r0/26828675473.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/34480640321.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/polenoruwelimofapiliwalu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/51377720960.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/36053648647.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4754615f---16247553390.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/f6bbd1d0a60f8ea2adca7649b9c3bdee/fobevutisala.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/19dm0rjgmjvlua9cuv46mheu3r/menaji.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nezewomesabiwujuj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/31b64131c510ecdd2f0eca95517c8f4c/7843682950.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/r8eeb5ejlqr1n7honmcq4bbi34/zupuvuzub.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/55704723831.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c28014b00fd6212060346ccbf4ee7292/10293725832.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4aa7c04d088a5eaa8ced5eab5fe8ba3/26062601560.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/21945647836.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/bolabibilakokapijoj.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/pemuzodakuxurefupebomumo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955b2a97db---24389073439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cool+leather+armor+colors+minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 18740 bytes
SHA-256: 270ef4cdaa9e7196d5f7bdcd4adba330eb98a5fc7857f73311c4971bb927f25e
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 18564 bytes
SHA-256: ec71a3da225281e1ab3d0456d2ade598005c18bea4669a5b5d5426da7806be9f
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 10632 bytes
SHA-256: 201e45d2d98738ef0df480bb1f5a4409515422d00be3840ebfb7e7b9a6528212

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