Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b6aa2bb4f660dd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 17:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6e4b26e5ec9fa812a7b0c94171be7a60 SHA-1: 14a6b41ded265fe2854f407f332658dfba469ea9 SHA-256: c9b6aa2bb4f660dd2ff44108107634b26a3c40428af7c783886c7229e8a1459b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=sony+bravia+android+tv+release+date PDF link annotation
    • http://free-note.kr/files/fckeditor/file/104101184661424ded34a34.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/55553659068.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/waxovaxarasewimir.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210905_160552_170.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/37212317587.pdfIn PDF document text
    • https://limsurempat.com/contents/files/dipurolugufedijel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7eda2254a---36967247144.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/judupotanusijav.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/savalogojikozapikav.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/5184485800.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nukelapopetufunub.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682e5e657b---gapafowuzerusigoxu.pdfIn PDF document text
    • http://eternoohydro.com/d/files/55483011572.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/kasunafukemirabewe.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/37224765777.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bewijimupe.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/69259912477.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/28464204810.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613095efb202d---86795830524.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/36003471733.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/jaxisaromuxidab.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/wagovagovalij.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/kosuxemasizebefuvelalepib.pdfIn PDF document text
    • http://e-menu.hu/editor_up/misajononovipa.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/silusuvadegasabawef.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zujowewiko.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/bokilulemevujufuje.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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 18732 bytes
SHA-256: 0f9b4745db6df96176ac37168799c1688a4915e58051a89d7516991179f6faff
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10636 bytes
SHA-256: c3f92d23cd741dd61ea62716a952a58f4a0604bacafc4678978236d126b40714
font_02_sfnt_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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