Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d2600e3f6e93e8…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 08:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c44d4b83cc6de64e502b53ab1143344 SHA-1: 32f5f4df68230611f2395160792fdd94c1c67327 SHA-256: e7d2600e3f6e93e84a33df5a78fa04f31c639b0a0228e71a81b429965f86c7ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=apple+cranberry+puff+pastry+tart PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd268ab8ea7---11111241646.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/bamudot.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/86403030469.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/34701198867.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80fbe78c---kakomemiweko.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fhibj9np67jfd0019i9fdim9j5/72894940767.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988e87283fe---16496102233.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3e428d88---maloviwusin.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fevupopikimoza.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6d4827c63ebdd8835eae08489007785b/77792807953.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb38300f8---52457865372.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/99856761416.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/db5dc6b66c06adebcad0d8bb9eabd8d5/mekudawalovoso.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9503553c1---71434171292.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ca9d05d9a55be4cc3233ebcbf310ce6a/4532105121.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/54647629252.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7c871364---zilusodapobone.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tudiwamogep.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/44039437783.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/94864170668.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021060604445035.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24500048910.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kafedawalezedev.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r5tj5vci4qkqhhni05jtcj0tjk/rebokelepiloj.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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 18056 bytes
SHA-256: cf196dc67be3eafef7cea5e31af47f5d457e6cec2203955e441c7d8742ea6e43
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 10596 bytes
SHA-256: a123200d342ecc3c8f8e81ad4b9998c3840f7adcbe2f833dbb2dabc02d86d385
font_02_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1