Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ae19d56b94a04e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 08:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e933da3f43923728c7f774699d9385de SHA-1: 75a7524985f26143eb00d066cb5d2316aa4e3695 SHA-256: d0ae19d56b94a04eb9217fbe525ea80253b49eefc121facbe41b4a12788c1bc7
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=lulubox+apk+for+free+fire PDF link annotation
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/44704513257.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210914151411_2yccck.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/74925554722.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/87063352666.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/76e6f09627cc73984fe5f1bebd9888a5/32730997368.pdfIn PDF document text
    • http://julianina.dk/upload/file/8658533622.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/robuvomofoladuwabej.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7fjhunruev1irqd6dkk7618r0e/kovokekawen.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/21771194440.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23b01864b---fiketuxataramawib.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/77240828927.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614465b01c90d---duwovov.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/6054126992.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lbvqpjmcbjpefaevvijen78hm3/nelutisojumapifasanome.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/vugunomolupulugeg.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/lisojat.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/galopuwupobevonaf.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/8389300196.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/17726144091.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/16963627216.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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 10372 bytes
SHA-256: 20b81021087178d7b9fe12788c5cdd5364da0f08ee4cdeefb65d5b3b2d0eb8d9
font_01_sfnt_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 18876 bytes
SHA-256: 07cd50550c2861911fd7302a2602d7d50d844a63c2982123a2cd8917f7b9c6bf
font_02_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1