Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bed9b20cdd7036b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 14:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c747f1601cf3c090614e94fba04f3664 SHA-1: bfa1193541678254b008b985ab0e2142d4ad83c3 SHA-256: 7bed9b20cdd7036b6395359ec7074c483a92436aabd71dc637117d2d0d8ab088
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm designed to trick users into downloading free software, which is a common lure for phishing and malware distribution. The presence of multiple URLs hosted on compromised or disposable domains, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. Although no scripts were directly extracted, the document's structure and embedded URLs suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=world+of+goo+for+android+free+download PDF link annotation
    • http://circolosilverblufitnessclub.eu/userfiles/files/pusexegunizigufisujabobo.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/nivokawu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/mosidos.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/24725508796.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/330d589e7a80fcc2f5b72b1ca9d99a5a/70595643813.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/xamumetuwilodofisemulos.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21091015544204719852hig.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/36249508998.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/tanefujosofetoxubumapo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0cb4c8f947c8ce9d358ffd9999840290/98085259824.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eda9eae9---82028001857.pdfIn PDF document text
    • http://precisao.net/files/files/79417181304.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6cebebf69---dadidisalupur.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161381098ec4da---7244890163.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/femofosipijo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/68140484368.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109082348106715.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gidumafinuxuje.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/fakimunebijolim.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/58473909497.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/4270268096.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nunenisuxudugufufufite.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d26593eea---sumuto.pdfIn PDF document text
    • https://ocw.tw/uploads/files/rolelumu.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/44385725484.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wagixino.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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 18756 bytes
SHA-256: c15e16255ed96adebd8e2789a6c6af473dc5ccf0af304eef728c2ca1952f5565
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 10344 bytes
SHA-256: adb97fe4c0b5cf0e214d36e49f91e434f5da27b26d9b897758803ee63fb57b43

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