Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12d5338f15e6e75…

MALICIOUS

PDF

114.2 KB Created: 2021-09-07 21:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e71c0343c810fd918ba3e61b356fb406 SHA-1: 25f4417448ea19be382f279b9ccea74b96dfd8b0 SHA-256: d12d5338f15e6e75a88e532bde9ab1ef4956181d0ff76e77b20101a6f31c47d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://laborke.ru/uplcv?utm_term=hannah+arendt+a+condi%C3%A7%C3%A3o+humana+pdf+download PDF link annotation
    • http://dchs1961.com/clients/871949/File/musomufub.pdfIn PDF document text
    • http://cpviettin.com/upload/files/xomiwerumakedubagiv.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/60184756325.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/walagagire.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/42b118da90caaa13a1469e7f05690581/54589791826.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/96c532aa9c1ab10569a841e3ff1589d4/roxenotivafo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1d3dc469c7d7a700a9f569fe88f48b19/44746547881.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b108d6f9d6949c059c4edb4ed01a0d7e/xezetivudenokapakuxu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubipaxuriwozijizoba.pdfIn PDF document text
    • http://abc-tel.ru/data/File/84235839874.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/88569423917.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77324452eb---82263938624.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc1fadde95f28ebd356a677e66d6ed9/bawobe.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0513d563337d408d5f1cc2ff5f5c21aa/27551558979.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/puxezosot.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63504422712.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c413c6690e---zazafavogizal.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rozeleda.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lepile.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/nagijigazixafawakexo.pdfIn PDF document text
    • https://razredna-nastava.net/files/26226939524.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ah3d46a8ktijm80jvq279jin0q/rawosutojagoboge.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cacdd9d82---80519932173.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe86977391---bamusifamilo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffda48e4b7f---43174397871.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_off00014933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001614a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614A 11356 bytes
SHA-256: 47b4cd7f9041fca4a6d1824b34271bd84e22dbd13a51d085f533f15f3ce59b6b
font_02_sfnt_off00017b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B0E 23628 bytes
SHA-256: dea9d1f7866017d881df65351bfa83f1e3248903c04a5bb341715c129d3839e0

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