Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfba29dd3f72cca…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 08:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7194f3f0554eef3fb461924a2573c25b SHA-1: fdb6154af722260a10a31282633fd6a5b05750e5 SHA-256: 6dfba29dd3f72cca1f95bbc6756ab1cdeae20c2c16a9fa0785e104eec9cf1b49
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs extracted from the PDF point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

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 https://medvor.ru/uplcv?utm_term=drug+abuse+journal+articles+pdf PDF link annotation
    • http://mindennapi.hu/upload/file/larijufiwikidifep.pdfIn PDF document text
    • http://51www.org/uploadfile/file/400dc9e35b3a7f9d61df0b401dd68bbb.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/32709486854.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66074b93d---55890846154.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c87eba66eb133bc9c77098b6e7e43041/91878779894.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/visese.pdfIn PDF document text
    • http://matras-devison.com/upload/file/65258575080.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/40560602895.pdfIn PDF document text
    • http://wdnederland.nl/file/timujamemur.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/58896174143.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/2550ae0b0e83102e463e9bb19fa1b92b/javukodevodopuju.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/24907909197.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/36633664764.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/71941995278.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/2527802607.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/mavifajudave.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vifuvegugogid.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/aab4a55fcf42d96e659fe7f0e806329e/zuwokagakikepugademu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf86c7f979---54133906910.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5a04decae---wafafotom.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6428bf9342174ec5677326bfbcb1ad48/60442826211.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75645118a2---wexugon.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/87138861795.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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 11168 bytes
SHA-256: b38d457e631b8db81049a7ad0e14191a508a36c0cc67a0ffcc5f2cb1a6406eb9
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 19156 bytes
SHA-256: 6e0631dc95736ae26ee63ebbe70483f4a515e17c3136f35ab1b72540238a11e4

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