Malicious PDF — malware analysis report

Static analysis result for SHA-256 891e42201bae395d…

MALICIOUS

PDF

88.9 KB Created: 2021-09-12 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c450e07bd17fd68c1b55ed825acebe9 SHA-1: 01ba8dc0d22a9e7f872f85296d8c1f0393d052a2 SHA-256: 891e42201bae395def5b8e230bccbf2f67c231218b4d56e4873b9169b43b5f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://2016.letnifestiwal.pl/ckfinder/userfiles/files/fanikufemarerixivaxo.pdf In PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/59457755577.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sebav.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/purenotizujedatovevozud.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/jiborezowapomo.pdfIn PDF document text
    • http://eternaseguros.net/files/files/36480174001.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/budini.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xazizewi.pdfIn PDF document text
    • http://ternovykh.ru/content/file/82205314948.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbe91a764869bc13fcb4bd016ad493/zepomerodudoxupufi.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/wixumojofuraloniwalawafa.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/10627798642.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/94644470962.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/88930368009.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/laxenu.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/26847527840.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e480f8c1b6ff08d670b64bf30ca81bb2/garokeraxamuvifiliwopujob.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/vekulivuwu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9aae81068---nelasinelevuzosoxeworota.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/fomegabediguwuluvud.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lonesuvapibojufipele.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/zagusububux.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a985dbe42---82578709123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hardest+game+in+the+world+mobilePDF 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_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10912 bytes
SHA-256: 25f05f41d24531a2db774fc4ad7a00be4394a26a399d2f1ce759fad53e7c0667
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 19328 bytes
SHA-256: 4ab882b434fd3be5dcac67adb890afdf2b41aa0296d19073a0c5880d086d8686
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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