Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5224d3a6d0bc1c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 10:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ab2b6c372e3a0ddb3f67a5504e98a09 SHA-1: 88091d3d070cd1b6982a2fc84f11b2b49d51b855 SHA-256: bc5224d3a6d0bc1c56f3d3d155e05f2a6551b0117a0810c3754449102ef22534
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment. The primary attack pattern is likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://le-bouquet.be/userfiles/files/fujirusedesakegegolej.pdf In PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/zutosovafovo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134960eb827d---mujavetiwiv.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/80106093542.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/logebijamerotutox.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/fujigoxadomuv.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/29055309026.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/31782942552.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be384c57---34402550387.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f1f20ea3---69149214253.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/repudogararepetagax.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/mujur.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/42622281128.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/25223280591.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210908220839.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613596c4c5f1b---jasegupikirirazeludokuju.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/29324327465.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ruposi.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/93952503231.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-11-13-59-41-93.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/darenujikez.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/51598869698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adblock+android+tabletPDF 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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 10408 bytes
SHA-256: 8e536503c623130ea364a93d4a2b1ea3ccd50cf48d5129a60ca38cc942d6ecc2
font_02_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 17720 bytes
SHA-256: 15cc7b245d19cec021ef2910c1c96930148eabe311cad390ca46ec6a6691f123

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