Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2224c667797e6c7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 05:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f07177e393b70f350db865f31e191d0b SHA-1: 6a106696dabd3ddafade5792863b6d7874e929b4 SHA-256: e2224c667797e6c7cf8cc9616525e10636f4ff8685a1b6723f5b03ae4c5e0e3f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.tecnobor.com/ckfinder/userfiles/files/ramabamobovegisazajutuvuk.pdf In PDF document text
    • http://wonikquartz.com/upload/editor/file/1631197861.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/23921950194.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161476073458b7---13410305345.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/losamafekosenebutosolijoj.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/66499487548.pdfIn PDF document text
    • http://canadianrockies.info/files/file/35807225850.pdfIn PDF document text
    • https://trieurodata.ro/images/file/24162129523.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/vabimumabimijowem.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1615000b6b3895---48545036254.pdfPDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3191176adfbe4e14214cc34f3f8bfc05/73658545122.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/60436985541.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/vexitomowufuxa.pdfIn PDF document text
    • http://kechengchem.com/upload/files/nasulipiragomi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/lexurivexabupepipimekines.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/maxadixaketijozuge.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/viladapevu.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/62957762584.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/futazisozirezuzesefojos.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/76530947297.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/55095115615.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/dexudadirufenibu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/32933615568.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/fugesegewe.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/dukerafakixuwalidufo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36129262570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+grossing+androidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 14724 bytes
SHA-256: ba637cf9edd90875d5f52a69c93e955c47abb105cb29c52f524d2bf8b08cdb02
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10256 bytes
SHA-256: 7073192cdacac8a749faa4175808349e463dd8067470f4226451679b960508b3
font_02_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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