Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f4e6bfb42ff74c…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 22:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d86ac38d0d659731baa3a21748feaa54 SHA-1: a91d85f39e5e3f6f209ca2838279a25efef08cff SHA-256: 25f4e6bfb42ff74c839de4c83d2c4c2627f32ab3137e4094315518b6f16971b1
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary attack pattern involves luring users to these external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=does+social+media+cause+depression+pdf PDF link annotation
    • http://uniquecharacters.com/upload/files/nosuvirelixodovidokedene.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53209502bf---65611053996.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e407d1b94d30f5ec9869f591e0359d08/pelewiseborukipuru.pdfIn PDF document text
    • http://93564497.com/userfiles/zojeforezuzobe.pdfIn PDF document text
    • http://dgkno.cn/upload/89738209651.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2933003785---22596990479.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/mitonuzelibabevori.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cc635a7674bda1669ff9ebcb95b73a01/vemeluzokumedafako.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/jilonolatutamiwux.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/49367093047.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/duvabipajepowagikuzejiwu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c4f4823f19394708a6fe639e9f8704e0/rupetixixuxa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a465ded1f86---jowulifipusosanejul.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/34582478753.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcaf91b19---wuwajaxewutejewoze.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/87645f88b2b2dfad43e6b7682b20cf4e/1152684309.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d90e8750---powifori.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wabete.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/jitifesed.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/zudadif.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/826286ca0415eac0059c34a79924aa9f/72702918261.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/99942294199.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/45211407638.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_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 17860 bytes
SHA-256: 988b39ac5d510078f203b9a5a06887238e1ec9971bc5c6a12560cac9dc0d8b59
font_01_sfnt_off000140b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CF 10784 bytes
SHA-256: f816fddcd32ec38184acbdaa1553064f8fa2c75316474af1800cdc10f3e678ab

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