Malicious PDF — malware analysis report

Static analysis result for SHA-256 159791d40cbadced…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4a9e287af929fb386951c793861e2d6 SHA-1: 344f2a4e368beb4c6fb231bdcdd58171c6de82f9 SHA-256: 159791d40cbadcede638be557f199d33dbdd6c598cdbfb1305ea9f5aab9217fd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://everywheregenes.com/uploadfile/qu26_qu106_com/files/77446538681.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fc618a30ffaaf8265df741978136ff35/70664974876.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/65376505327.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/89019847284.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/govutefa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p8v7hkohkv77qrvi2voo5ceb9f/wiranaweg.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/midabuninukojesuzubiz.pdfIn PDF document text
    • http://identik.hu/editor_up/dumejabedu.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/gedaje.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/buguzawobezafikumola.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/kisufogexe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kbhj961o4kda11blc04olhb6nq/66446736374.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8ce5061---jututurajirepinunuto.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nokujomoka.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/198686107261457b8de97e9.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/3785060692.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/ximedepiporube.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/76738493574.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/fiwijipavejeliridevaf.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/68810788320.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/modavuvipazagizobavan.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/63641707906.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/64703217392.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/zozugadivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+25+prime+or+compositePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 18252 bytes
SHA-256: 347ba1186b1fc313dba6eced60cc352c0134e597d1ed1e8816b49f5390f577f0
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 10428 bytes
SHA-256: 9fe36d35a273583338c45cd2df683318a97998f84f549c49c6437bfa410fdfe0
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1