Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cdcd22a38d8a41…

MALICIOUS

PDF

97.8 KB Created: 2021-10-17 05:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1962fca7bf6536f966c66e60a7d2f094 SHA-1: fe3e4df96a7b27210364e3be1fb6c0d7c3823274 SHA-256: c5cdcd22a38d8a416ac96d7eee435e5f40bd77db891f421768126a440fced8d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, including compromised WordPress uploads and disposable hosting, which are indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://111-orte.de/testarea/cwsCMSlight/media/files/27091038022.pdf In PDF document text
    • http://kalbaninc.com/userfiles/file/8936099629.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/vudusupubonefowuxuv.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11018619531.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fa4fbe3e0---juribikuwin.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/94034234052.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/20944910810.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb96819f74---tulagasedakazu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/rebalowupaba.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/fekim.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/50094222288.pdfIn PDF document text
    • http://cpils.com/userfiles/file/wusademiwikekoja.pdfIn PDF document text
    • https://curvy.tw/upload/files/misubuzipezo.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tubilexubolenojozofon.pdfIn PDF document text
    • https://diagoldjewels.com/userfiles/file/bogatusajagirupoz.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/94463067035.pdfIn PDF document text
    • https://0900107678.com/upload/file/24243789411.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce1cdda49---94857618585.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/54224722400.pdfIn PDF document text
    • http://18554080.com/userfiles/file/99016265497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=deep+space+9+trouble+with+tribblesPDF 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_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 18992 bytes
SHA-256: 39cdd5d60e17af104d2df1be29dce335f42075afc16e0062848f844d89dfcda8
font_02_sfnt_off00016132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16132 10864 bytes
SHA-256: 5db55c1a616329c2faab1247355bc840e688eb2e2995ae21718250d452a7505c

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