Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed6fc5a4d532ec4…

MALICIOUS

PDF

104.2 KB Created: 2021-09-02 09:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88d0b495209f20c4a3b71ee6227a20d2 SHA-1: cc6ae829818cea30b5f20bdff923e69096573fed SHA-256: 8ed6fc5a4d532ec4cc8e19cabd399b7f4940252843d32539df9e301057bdb509
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host and distribute malicious files. The presence of invoice-related language further supports its use as a lure for phishing attacks.

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 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.
  • 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 https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6e750e039af777e8f27e64dfa689fc46/wesonudupanixuwilupugawo.pdf In PDF document text
    • http://cadelupo.it/userfiles/files/97029153029.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/xixifuwonakuxekexet.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d034ecba8d4---53198421797.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/aa707f97c3b7329404b9e9a553d48eb8/lesuvoxotan.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/40635412525.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rudejojos.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/8828608644.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ropog.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25db1216cb---35645919902.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/wedixejaworujo.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e63771e150776fe2bfdffa99c85c23c5/76844263312.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/18577dabf16679321746133e4bac8bf4/filonusezowazusowoguj.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///petikiwutetidopif.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3b3a5262e---98152649063.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/67719886438.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tumudomugipesuvafeninapo.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/tijaxegakarunu.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/15903885571.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16076237ede794---bemixalor.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zutelutimofapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=s22a+road+traffic+actPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 10216 bytes
SHA-256: 5904507d4d0ac1d014dae8642811f99e7891e264bc3c52f957c09d7233151bac
font_01_sfnt_off00013ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF6 22624 bytes
SHA-256: 215f598e1bac2dcec6e6af61985d451ab08430b61a64a253205f4f5a7a2ebe51
font_02_sfnt_off00017a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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