Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35d4d8638d654e1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 07:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba339f78a74f39eb97572fbad874fde7 SHA-1: 3617a0d260108f24f0a045f3b30fe8eb5ee6f920 SHA-256: c35d4d8638d654e1badb9bcbc572425310a8976761492e0b478340ffd77fa6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=combinations+examples+with+answers+pdf PDF link annotation
    • http://cherryontop.pl/upload/fotki/file/lanejoz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51d412112---74356143188.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/jineduwagejatawev.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/026c4af888298bc24b4b2dee6ae8deed/jesozuzub.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/62063164586.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/nidaxojupeguzed.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zumajagegetubisiwif.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa632c6e61---21459862643.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d6b6f8de7ee44e4023fbdcffc32aad9f/86802634808.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/258a7ef3b600fc6bd94e23fdeadc73e2/45159520900.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089023431067---85515326693.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/berafabokaxuzosulaguxamo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55e497f86---41259767990.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/91fb22c7f22aea2ebaf331a05fa30ca6/mevubumojaga.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/08c940c74dd0f249094d1a6236275d97/bagebusamasetalekux.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/mukumar.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/dujemipiputulak.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nodunixariliwep.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/38219739353.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/kibuperilenulemurewogor.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae9f7c7bd---vumamoxatumuver.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/napiwusuwopazeder.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/xutonebawigobofu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/kemibosogu.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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 18612 bytes
SHA-256: 594dea6ecf6b3cd2b7e4ae3a63e69a2debf699c400167dc2fdf9e027ad8acece
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 11124 bytes
SHA-256: 83b9ea4523718548e679d1504983fe57bb05d8eac8c349c833c8f8b5a3eaf66d

Open this report in the interactive analyzer, or submit your own file for analysis.