Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f3837943321c54…

MALICIOUS

PDF

94.4 KB Created: 2021-08-05 02:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: caa36611d45eacc2e2d5691447adc0b6 SHA-1: 1a1901171940e2368b9b2d61a1880f1eb4dec46f SHA-256: 35f3837943321c546f50ba053b011836636715860af4dc99a268f8ede50b4113
184 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and ML classifiers, with heuristics indicating embedded JavaScript and multiple links to compromised WordPress sites. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the links suggest a phishing or malware distribution campaign. The use of compromised CMS upload paths indicates a tactic to host malicious files on seemingly legitimate infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b40c2c8740109ca97b79b1e53ed185b5/jugegagivowozemazaxo.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9feb599e---40191543766.pdfPDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/75535183921.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/68364793070.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dukijogofalelapevumo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/509245e575a77603444d78c4e6c808da/54556226233.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/240471248.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/37450248828.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608198270fd4c---21402042118.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3f51f50ed224bacdc782960bf3db546c/5619138456.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/31028712713.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kudamifinuvidivedisixef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d2c998551---94630885653.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/bunakizane.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ae2c959e---30417305238.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16ec9e511---fawoko.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/99779163976.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/viwagawi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e747c47c2---87228044272.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/liwatetidizakulojodor.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9c926677f2a4b21033a2427b7c684239/14445461746.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/68711506271.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/75026842342.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7822d22c---15067107917.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86874347395.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ea92662---faxavajekikunizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=duralast+700+amp+portable+battery+jump+starter+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 10976 bytes
SHA-256: d7ed2f2b43d3e68d88f55d7cd13d9331503508054e0e0e08cc454b3768062166
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 17512 bytes
SHA-256: ca101dcd075dd03b2c27919c86f78b0272d8cd30418193013686f7a962827ebe
font_03_sfnt_off00015ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDB 2668 bytes
SHA-256: b698b531a87b651ddf6a9a592ce8676b2861b16996b8d9d6dae956c08bc9f40a

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