Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff86f31df735db6…

MALICIOUS

PDF

90.4 KB Created: 2021-07-30 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e62999489184e8bb8c0c2c02263db43 SHA-1: 4f8a235879fe8f79a018bbc30d5d6678a07b0166 SHA-256: 4ff86f31df735db6e9d49ac6a0a22485dc57fa864e614cab4d4846b99283f0b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure is a common tactic for these types of attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607155fe8fe8d---4451945929.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817af36b822---83827057.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723076bc1cd---busoto.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea9ec92edb---jerorasolokubumozesaluvaf.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/16636809672.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/50643540447.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/xutisepozix.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0cee0ea66b2512fc4c754777175aedf8/20107606888.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/wevusikotisudesemasud.pdfIn PDF document text
    • http://slsnn.ru/content/files/kixegadamomejado.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pudajagikavemif.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2ufk8nbbpr4nul2h3or1nf4afi/11443499128.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/kawaburovoxotobudilel.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pimelomovu.pdfIn PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/ximaturelefubedoze.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a08b7492---57800917239.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607addb736791---xuribigimujudawoxoxewi.pdfIn PDF document text
    • https://tempegaring.com/contents//files/45577528749.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/40282984472.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/60894376361.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73202033555.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/bedozi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/zegov.pdfIn PDF document text
    • http://standardamulet.com/files/files/gigilabupejekevejumumex.pdfIn PDF document text
    • http://funperm.ru/content/file/4538305590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=parejas+de+rebelde+way+en+la+seriePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 18184 bytes
SHA-256: 4c78125e204caff4d3e14960743919c74a0d5154dd7c650e31961554d8e69913
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 10492 bytes
SHA-256: 27417b656325e4c198abf698b8da219e33cc1020a8799cc0a673ae88f3d2650d
font_03_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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