Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef9850421c2f0a7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-13 11:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc725edef2a622290c81eb48a106ba52 SHA-1: 0eaeacdee7cbcb119906ac5d1e52584e64c7fb28 SHA-256: cef9850421c2f0a789e402e0d8bc0f583a404d296ba9f36ef1b07db09f5acdfa
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, with many external URIs pointing to domains that are either compromised or disposable, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=42+led+price+in+pakistan PDF link annotation
    • http://dealershop.es/userfiles/file/danuzamolozilexexigitolem.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/gulofonur.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daae9651a7---zuziwadisavulu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85137233060.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307dfb6b520---moxaradevuxigagozigazaj.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pebejalo.pdfIn PDF document text
    • http://lejuriste.ru/files/file/vexozixamar.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/49198539709.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a8dff9229ca8f742cc8e9b6592a01cc1/43432880633.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1023a4b8d---kafiteduz.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/losoxatuziwizofoj.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/denuka.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/29487616860.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906075220.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/zefokapaminorivefeze.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/77284178532.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nujapudiwerenobekexefez.pdfIn PDF document text
    • http://hongdacable.com/d/files/41497792823.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613548a2269e0---tovagevokow.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/mabemavemefadazisifivivir.pdfIn PDF document text
    • http://bdsductri.com/upload/files/xugoj.pdfIn PDF document text
    • http://lagrupacio.cat/file/88536262163.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/7415753827.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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 10580 bytes
SHA-256: 0832a03c264f7561e57c357af94c222ca87cc45bd910c0767421555d93cd50cc
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 16532 bytes
SHA-256: 0c5d348275e06d3a5eb8b158bf14780bddf80a129be29a9763ac619af9b33dd6
font_02_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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