Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d748de0e266549f…

MALICIOUS

PDF

94.9 KB Created: 2021-08-03 13:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7222a7c6134638fa4a14a0ac75bdf96a SHA-1: 3c6eb79321715417f061e6a13bfbecbef42674e3 SHA-256: 8d748de0e266549f914da7c9794966213a33fdbb21fab81b515850fad764250a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are hosted on compromised CMS uploads or disposable domains. The primary goal appears to be redirecting users to external sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://tidaksusah.com/contents//files/22998662081.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/94857294069.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/39076749616.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lj56gmnffod1ahcrt0usag6012/73239759929.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mdogm7sb3flkqnfd63gq4ptk6j/kulibisal.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/lenobuno.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/49320666930.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/50551259325.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5c9d90593---torowolavesavusobak.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4bd1848a77b113ba1283d35f4d3fcf5c/63535343185.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/guxugiluxebalureso.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/vifosag.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c15be99a875---24971229285.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ado4eogubu5ahcjlu8a8b42sr0/3579725805.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ed0ed34b753c13b34193191f0d1b6c00/33329160921.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/83265519488.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ae58fbd0---29958501899.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/14675086985.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/953f601a68b797945e3cbde331de8310/76234632528.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bomijoxafekoxu.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/kurasixekiw.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5f7o69mc7erbp0uavais8eba73/novogowedenelom.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/18257064037.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/luwerefaligewadubos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hummel+price+guide+with+picturesPDF 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_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10752 bytes
SHA-256: ee9cee407878b5dc0f2ad4e5cffc51c8d00d2132f85c94b69010db67dabf0cef
font_01_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 20920 bytes
SHA-256: 33462045d107a76d56b940fa95b326e96d296279cfe6679144669c2f1cf596d0

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