Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8b78ce08c9c6f5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 04:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db378f68a3a9e0790b44081245d2d69d SHA-1: c7754261eae803ac1dc099854ff766b152242d05 SHA-256: 6b8b78ce08c9c6f53a8fe9ae2fe5036b450d489d70b2a8893d123a73473c0df4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, characteristic of a link farm used to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ccsctda.com/ckfinder/userfiles/files/20210907_053235.pdf In PDF document text
    • http://phuwangnam.com/user_file/file/nedogulegusupisuwudimo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131778e939b9---29845448526.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/78384351656.pdfIn PDF document text
    • https://znalac.com/userfiles/file/50360998864.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/nigumipoxurevomikesofi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/57507205008.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/603192828.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/7725844079.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/40261339555.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/72851300229.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/xabidanaxovafotaruzutubal.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fovogu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d9c2a45b---sezoponomogiluzefomominup.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7638b1fa---rozikojetowufepo.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/10535453003.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/vetenezow.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/90746695869.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/soboledezojazopozazo.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/17292832492.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb8553dd6---80609622989.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/85f2l6fuu6maq4ea20ve5l3iod/6270806102.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/50215416266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+file+to+pdf+macPDF 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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 18008 bytes
SHA-256: 672e1da4dacb8788cc79dd764724f0e52fd70b1c414598b0d5f888c918b96aaf
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 10708 bytes
SHA-256: 1c7b30a98d4f79deb3592a037f1cedf7454d7763c310d1f1c32102ed8e198fbf
font_02_sfnt_off0001284a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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