Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db92b1a218ef8f5…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 06:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9aebb307ce2e1e95a375b1d92ad90078 SHA-1: 6c1848d9166f4fed536f3d1abf2af11d73e0fe22 SHA-256: 5db92b1a218ef8f544777ddf81b5c75f76d54367be546039dfceb425a9aa06bf
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=gold+price+in+nepal+one+tola PDF link annotation
    • https://marcuspietrek.de/MARCUS/files/file/49030667363.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/511b5706cc467e4e9a7ac1bb54dfa552/47621294380.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/58212227216.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2e34ec9b68e8921d6e334f2e9433b5a2/vuwajimitedaw.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b4535b3eb---57297124424.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffaea70bf---xofodoteserakodasasubax.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/617bd7451408f1cca33982c74259bd65/89110001035.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/83261164465.pdfIn PDF document text
    • http://novichiha.ru/pic/file/dufukilarokavixuxesizep.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff29af72a---wedarenokogedelurira.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607791ae825e6---xapewemirodimab.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ce22e14---75238975940.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b436eb396b---14308475863.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/74678125182.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/594236161.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/28249100415.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/92468498270.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/94389843102.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a1d305d8---regikij.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fe3b47d4---ramorumolezalug.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/guvapikepimemugup.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vadesuk.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/30724035411.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10380 bytes
SHA-256: 4c8fdcf62b1d70cb1dfa9be2e2c8cd8400fa28faf70b3df007ece40776277ff5
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 17200 bytes
SHA-256: 0fbcb082edbfaec92a4a215a5f265f4fdec378db74061d960e6b07d3e10208e5