Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bedad5c68750815…

MALICIOUS

PDF

92.4 KB Created: 2021-09-04 22:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 084d4811cc495d133d0626d861bb49b2 SHA-1: 938e2ed8db5cc41bdc884b9e5839bcb6839c3db1 SHA-256: 8bedad5c687508150586e86ec3b41858716204de9c6cb300a353d9f7ff566764
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of invoice-related language reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xn--oy2b19v1mb1yi.com/userfiles/file/25389542845.pdf In PDF document text
    • http://solee56.com/ckfinder/userfiles/files/21826497186.pdfIn PDF document text
    • https://dietacud.eu/upload/file/6533975947.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/guralevix.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/pizovusemalalopapoxa.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xonij.pdfIn PDF document text
    • http://www.zolmedis.lt/ckfinder/userfiles/files/nojefig.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/52060770906.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8a18a34d---sufuxem.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0ab9be480e70b1362e026271b8240267/33641254310.pdfIn PDF document text
    • http://gyobel.itpublic/file/rulosoro.pdfIn PDF document text
    • https://htchninc.com/d/files/vakusujajodipadi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/28cbe1c0dd5c80026ea94e7a6bc2d4dd/3498737599.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53772327993.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/9f85428e4ee339ec56107a5ec07c6105/10130934910.pdfIn PDF document text
    • https://asi-filter.pl/files/file/sorafedozapusefaderuk.pdfIn PDF document text
    • http://micruts.org/userfiles/file/vevaliwizi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610358cad4054---lolimu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c9c17e0b---xalogokuwesitubuvude.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8b5fd68cc72281e1fc03f374f91589d3/525370601.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/junusapokewanejebekeduf.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/dojerukiwadarofozufat.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/87565147775.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wivukarema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=accounting+concepts+in+telugu+pdfPDF 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_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10616 bytes
SHA-256: 76e468205d04c707010d0ec195cab1618b05c68e233d6372f5f6bce80eff81ec
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 19096 bytes
SHA-256: 56117c68775571ad035362014826edd89b0c414b179d3387755f3b4a9e0dbca5

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