Malicious PDF — malware analysis report

Static analysis result for SHA-256 4600dc7f293a5e3c…

MALICIOUS

PDF

96.4 KB Created: 2021-08-02 17:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d81ba1493886a9c03d41d6c8883aef9 SHA-1: 1b92e20fc1be3e2d474f14fc0620f9f799176d75 SHA-256: 4600dc7f293a5e3ce20c355659061a20265afd252ca89999a61594714beffd3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=ph+at+half+equivalence+point+of+acetic+acid+and+naoh PDF link annotation
    • http://simonide.org/userfiles/file/12469614570.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/1770968150.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/88777988442.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/lexelo.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rabadixuz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73e126f99e1845f6ebc94a0f293da145/83261087769.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/wejalomarubukigikub.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/gegejuzaluxe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a118439df4b76b6b363d569debf68767/6869306011.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fibasipizer.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/vijoditapokinir.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/88b2b90c248ab0d6e18b3ffbe6f81208/powopawawi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033eeb9c99---94220945219.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/65339741019.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fafimetukinakoto.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/42018db6f603fd1b957380caddfb36da/54405902925.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5e1438957eddba519e21ef5114111a91/tumojonevo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c38547934---xozukurumekozuw.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7571cf27---taxuvizubofora.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/bixegubiturapufoxaxelo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf686d107ba---40994848873.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79f399bb1---begafud.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/22/file/20210622_174440_135.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f2de113a01f126e06e6fe17f3de1d4da/vuzomasimutukitini.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e93d6de928---kuxofekufelekufewefe.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tidabupevisakizega.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_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 10764 bytes
SHA-256: 038807d15de5f4d6c98b22955918ee54cfe3df49025ba6fa9544cacc1ec921d1
font_01_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 17740 bytes
SHA-256: 42ac4f6c1b8d13163f2e0834efd4c35ee096e5fdef7a26c1509b55baa09a1e25
font_02_sfnt_off00015b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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