Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c8a208a5f20be5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 18:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62c384873f917c868403a44d09704cb0 SHA-1: cef9af47ff8f0220083067c24d194e855fa0d6d9 SHA-256: 94c8a208a5f20be52c575999a78041c78878b0ceaa26c0568b39f245edbdefcd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiomilano.eu/userfiles/files/23193809082.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210619_9E9C7F1A70ACF981.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8ddca66471a6f0f679f2bd8c4a3d0e8/59415812665.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/vefovugorulobibarawakur.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/61448702576.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d588e11b2---12392954856.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/020d392fe1c50c99ce536bea3f07ed59/sakoxepifalu.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/ginelajamosegirevazo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a81123ce19d14e46cff46bf2b6c0f73/lemepabenos.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/53194930435.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/wijewegivifagezedome.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9f8a4ba4d---56541096172.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d20a75a34---muzipolesigete.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jewukesilafefosaf.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/disejaforuvozit.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/20207068330.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875befe1ef5---gopetewebufuzonafipetuked.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e581c0950fe3cfbd1c561a7bb0e201cf/jutirinajipi.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/65917333715.pdfIn PDF document text
    • https://bor-diing.com/upload/files/jomuzuwafumukexes.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fe718ac7f05d551d369121742f46ba56/92848525166.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/voremasitadezinamidedir.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/26535596188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=language+symbolic+power+bourdieu+pdfPDF 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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 17668 bytes
SHA-256: ea5f34d1fdb59fa53275bead982daf0db7c6d553a6b8ae52ea9b7ca7858c1094
font_02_sfnt_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 11260 bytes
SHA-256: 4ed460338c6094c2c7b5c962ee863384c8f769f889761a1df4ffaccd249fa1c5