Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c652eea048d63…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 17:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2395c84d25e7d494893a1748db6751c SHA-1: 196972796d60322d512b5e3b746fd395487abab6 SHA-256: 0b1c652eea048d63d35cf0ffcbb1f5aff7b5c046af616a683dabf89fe5464210
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary function appears to be redirecting users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=llb+without+entrance PDF link annotation
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/pumiginivekeruxip.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/85876578792.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/82100459481.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/nobeg.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85fc9320e---71681150595.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fb80a85d5a768a20c611ab4ceab633c8/jepovato.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/gojopafobalapedatom.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/wawepi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42ef8a10a---67510701946.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/golememofirusuxawagan.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/85919117843.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/un97daa350mp91r4mdkdm97k80/gunumux.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b2746320---luberadadadebufamogaf.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/robewodararobomirizamaz.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/37605800098.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/22276769671.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40af613504---34773129568.pdfIn PDF document text
    • https://belloverde.net/emailer/file/noxatupaniz.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6147caebf56054ba1a3f7cf9bb47724e/nilabewute.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2bba6b9dc---17077976721.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ec9ca0063---gofamopirozazewanot.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_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 18084 bytes
SHA-256: 94bfab7e186d39189d74c5fbd2728503eb6c32d7e6e8a16d69e609ee61e03592
font_02_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 10444 bytes
SHA-256: fbeb13ab29194155e59c212c0e3a059d9671e5f9b52b08c4accf1c66a5914707

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