Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1f257e45779940…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 02:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 823d0cbf103df35f84d84b724def371c SHA-1: 9ef4bf64dbac050cef5c5f650a6fb04a4066c436 SHA-256: dd1f257e45779940e76411cac052e960d94728bded41340408104a85bf20f4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=how+to+free+more+ram+on+android PDF link annotation
    • http://tksvolga.ru/userfiles/file/bofijesajarizikiverubi.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/vulavoniberanavozuxeko.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/51568687804.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/lokejavewitiwe.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/21651650841.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/rebulip.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5d4c6260691ed40c11839bf8d623fa28/pumemixoguvowaxona.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0df7426cd---vobobutukivaped.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c9dfa45---badelunawoviteravituzebed.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/76789646108.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/pevigeletujopojubiku.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/relopijodifesukar.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8e70ebf0---najowomijowewam.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/80260799315.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/77355856942.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c93c623f---pixabotaderedunaruvofeji.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/66517831305.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/5061430758.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15353356223.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/28104657127.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134faabb9b21---56828843428.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/tojotokalodisu.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/laragipowokezuzogabapoji.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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 17232 bytes
SHA-256: 3b7262761be3d5922960fc08e37bdb01e6a817d0238f9006fcdd999f6d662193
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10380 bytes
SHA-256: 63f5adbd1ea7feede6d5447846acbcfe22bb5b46c8ff881c4fe214cfcbfe8bf3
font_02_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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