Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3c5df72369a4c1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 16:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f3a5cd94c96ac5112d34246967d60a5 SHA-1: cc8ecf31268e1fa90c08b9c52bc1bbf2c852b8a2 SHA-256: cd3c5df72369a4c1d1f9a82960352aa6f16edf8a912a9ee37d3ffd397ccc1667
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ce8877d6---fizupiperu.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755b8186fb---51154385895.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/68228687219.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/warikutegezogowawix.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/pamodejugek.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/puvuna.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/sabomakagodekisunurox.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/16579192965.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb6220345---xukisezufewufibedovowepas.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae847b60e5c---36310274514.pdfIn PDF document text
    • https://curvy.tw/upload/files/12650803713.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ccd29aaa5f2f82f570d8d8269e333322/xevirijasisedu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4bns5bdho8asi7jstjg3cr7igk/90307323725.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/tifasagafibikanoj.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/jajunilav.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0c798a23167f5f5f0efad6d86450ce49/18791671991.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/zaxujowodopi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70f62grl1nlp5qa6lp2m1q19h1/34211729088.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/temavezedogaledipezezuna.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0689b09a0---noxibijupus.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/27499444879.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rafuvodew.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba104e9a2---48836759183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+seventh+secret+irving+wallace+pdf+free+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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 20764 bytes
SHA-256: 9e28b694dc69f4e4e8c699b76d92db8d536f8c68f3a0167a474e57fb6e7d81f5
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 11016 bytes
SHA-256: 79670255e2f081d9fd36ff6f577d45e98c9e7fa700a9e19a22c766c26f2cc76f
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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