Malicious PDF — malware analysis report

Static analysis result for SHA-256 7575b3172dc7cd85…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 14:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 386384ccab1058c076c7ee882d3129c1 SHA-1: 8b9fc7ddcb9b59ef2854186ae999c86b81a2bcfd SHA-256: 7575b3172dc7cd85abf560a90e90a46e704332ea388297eb15294f5ce641ca5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document intended to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+do+you+unlock+a+phone+if+you+forgot+the+password+without+losing+data PDF link annotation
    • http://smolninskayahotel.com/userfiles/file/xejeselewilij.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/21482249572.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071749421009.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/nexozisegesevu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6417a9e0---xogidelopivutaxe.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/kebutosixominunatesatex.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210908232936236.pdfIn PDF document text
    • https://serka.com/serka/upload/files/90615352696.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/54150835540.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6eb7873944c3de9b2793df6a5af72a98/68336826289.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/21995096726.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/8979214925.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/bijizawafe.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pokoga.pdfIn PDF document text
    • http://erpos.sk/data/files/wezekiminu.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/selesawuvagol.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613667866d97a---81435874209.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/suwifedamesilafobozugoze.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rutomuvedabigineladag.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210909155245.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/68213566928.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/86480582934.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/18562967773.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/72808838039.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613589bc0444f---fusuxikenaragara.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_off0000b4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD11 11284 bytes
SHA-256: beb053ed499ed8376bc54472b49a5bd6d6572775081425f3ba79acbb544703b6
font_02_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16500 bytes
SHA-256: bf601158a25fd793323a99cd95b03f28ece1545854cb2136c3597d6c380a5951

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