Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc21c2bf684450d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-26 01:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b7aa717a9cdba059eb4c26b67b319e77 SHA-1: d2d33ce331ff192e0abda8e67ec4f530bc7b8af3 SHA-256: bbc21c2bf684450d01ffc396e22725e5cc1ffca5868fc5746635b619093c5b45
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a fraudulent number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://philabc.ru/uplcv?utm_term=slownik+angielsko+niemiecki PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f79b20c28---95078676834.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/185817045.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/49527902571.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/23848853446.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/melipifekak.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe8a32276a30401157676596ef7c4156/lezezabagepe.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/gikemobaxexufokewi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e83ecbdb8---puriguruludakaronaxijonox.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/rigiz.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/51946236309.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/xavolobez.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/waleredufofi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614568ae17d71---33411743211.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96709250066.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/9006609048.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/39417566417.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd2429ba3---46091188138.pdfIn PDF document text
    • http://anninh247.info/upload/files/98338307321.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lekefofidob.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/namabunoziwasesag.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/89461202803.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/ketezarineva.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9u0uvukggctuuneet4mcmn8rb6/76704229383.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/63769906428.pdfIn PDF document text
    • 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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 18500 bytes
SHA-256: 04263b6487fdb6ad02566351fbaf6f976a538edfe449b4ee34a919364fc841d3
font_01_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 10628 bytes
SHA-256: cfc962e469fb01f1d06dcfa03945de3afbf875c9435c7d5e78eeeaf226113976
font_02_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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