Malicious PDF — malware analysis report

Static analysis result for SHA-256 1596d9389644d78c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 05:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1e18e804baa8ea14696b583a3d0cb38 SHA-1: 12acdd691b0b1c37a9ca7ef52009c939b1644bd9 SHA-256: 1596d9389644d78c5920f877344208c75a09ef6bd7a5a2e3eeb842e3e92be4ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click these links, potentially leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://terlickodds.cz/www/www/fckphotos/file/julubifexak.pdf In PDF document text
    • http://k1a.ru/images/files/file/11358942518.pdfIn PDF document text
    • http://vinmexindia.com/uploads/gixiwokugoduvat.pdfIn PDF document text
    • http://speckrepej.com/upload/file/96155173283.pdfIn PDF document text
    • http://heizler.hu/files/file/20577156180.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/fidakogifa.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/69704573648.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/07eac99acaf16081bf6818ddf008722b/5079766940.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051103295073499.pdfIn PDF document text
    • http://net-marketing.hu/images/files/netirabuwi.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/85005136666.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bovuzeduxumetubiloje.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/89669551550.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/95832745636.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/neloromopovari.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c229c7e3---gimuvimilisofawosuzali.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nd7j6v3jk44qbjqtpd4vu5bjed/gavum.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/dufimilibiwuxemodaxuga.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wobexida.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b83ee6fd8---67011061943.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ba9e4d8d---89532849635.pdfIn PDF document text
    • http://abpaluso.com/upload/file/62619495917.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/66673062162.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/12802800561.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe115480b0---41595510932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=electronic+book+pdf+downloadPDF link annotation
    • 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 17548 bytes
SHA-256: 60151394bb07f1c596e92df140258d6faea2988f73cf7bb5217c370db79f1bbe
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 10748 bytes
SHA-256: 8757c649c3600248a2bb30836018cb5752855e8270ec9522ca7cfffda3d7ec34

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