Malicious PDF — malware analysis report

Static analysis result for SHA-256 294331333c57b948…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 20:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c2e16f6e89b4d5b541028f57f52de98 SHA-1: c0ebdc4f628631fa21d8900ee316a82c6b04f7b0 SHA-256: 294331333c57b94869fd03adf3def19afdfe6e0b1f2575ec9402c0afaffc9e23
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=what+does+respect+mean+to+you+worksheet PDF link annotation
    • http://formel1vermietung.de/userfiles/file/julitugivaso.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a8b7486c0---7454301609.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/gitepilasipovasol.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/garuletekusipet.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/86411209816.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/zapanif.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/topovupimivaniguzorezixo.pdfIn PDF document text
    • http://surtek.biz/image/files/20150224_081505.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97f58aab2---27292267084.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072413024578.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bc4aa6e---gupurasabedowekodinawox.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wusekojemizolinajuw.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a350c3a906f---bapuge.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/64231674317.pdfIn PDF document text
    • http://learningkey.org/userfiles/gigoregujarosevirom.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/pufamanifuvefisiji.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cce44216---74669468294.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/96639368451.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/79821479493.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/61598338038.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106486e377e3---86195772987.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608607eb2ae7d---ritanomebixed.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/vebonuxogapidavonigag.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_off0000bfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE0 15852 bytes
SHA-256: 2d84dae7b478f14fa0556a0a740aac79549a0b921e5c43fd09622349d799f6ba
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 11024 bytes
SHA-256: 03fda56ce35a73666c92dc0b1304be3d59d6a65f5e585a5f63b609c6efbcd771

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