Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3d63ae98a5672…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 18:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 968ce733511f7d960740cb27ae4fac05 SHA-1: b0dc34fa933617ed5f22285c7a8aa71c4bc2c908 SHA-256: cff3d63ae98a5672089cdcce0f5420f63b1e3da2fa392f15ab7ad7f7c77619fa
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c23aa2fcbcbc343b45796687d2517e80/tusuzobopelu.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd4d97db7---xirogojerisifubaj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8917ljoj1bs4jquju5cv2oqrh5/97266517474.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/78642135500.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9lpjg3egr6s352uh01elhv1nen/29235141481.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//21405055334.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/13266992728.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8cb2eea5369396cccc39461024cae37f/56165584172.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/85122208498.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/1d2570f1e9983ef32bd89aa44b72b7ff/60979255493.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/xumizumojirumi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08c1950355---pagomimurasiropinu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f404c34---meripozuzagasa.pdfIn PDF document text
    • https://ekransamara.ru/files/91480021929.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hgndk9m48311fvctbsnh4hg4r6/pasozelapulata.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67ff3f8de---jabawajakipivom.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/73627151286.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/kibokoma.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fesuwome.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/l8l3nugq64i5bn4tfsbj6g0eh3/77884111696.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/nadajinanor.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7ee82b68848654c6f08cbd6808adfe0c/sapazalajologuravax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=all+x+ray+position+pdfPDF 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_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 10556 bytes
SHA-256: a78de8a41954fb9f62bae941f8645326cccc6792ae46f18ff539f15e8479094a
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 17172 bytes
SHA-256: 3c937043e5d4b5a4d8ddc3d2ff6b2371e50cb86e55e9e4cdccdc5c5bf91ab0c6
font_02_sfnt_off00013db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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