Malicious PDF — malware analysis report

Static analysis result for SHA-256 89281d876032d9f9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b8533996f6fb332d3f2624fbe1da14e SHA-1: 6c6852bfdcc85ccb5fff222034a13556874e2f17 SHA-256: 89281d876032d9f9a99ddfb527d8569ecaea7cc59e2fbafd11e9802fca72796e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are flagged as compromised or part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/fagifopiwaxepojodemi.pdf In PDF document text
    • http://zafirkort.com/uploads/files/34612673392.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/35577965933.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/zetatojumivelik.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/57346477135.pdfIn PDF document text
    • http://babamoleskine.com/files/file/21914264378.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/zonawiz.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/gedupinan.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/nomonogifijewufuvog.pdfIn PDF document text
    • https://buyafranchise.org/files/files/bejoj.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/virovusumabax.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b68e1a9e---maxes.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f91082f8---34371127256.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b05694---21050555718.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gabuzatemezusa.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/42485846494.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5abc4f6a---tikazopejupobawawitiges.pdfIn PDF document text
    • http://trivio.it/userfiles/files/fulagapipir.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/82558107615.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/98d981e4e87b2ae7270e0bf2d61b6ba5/gagivetakifi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/20153073015.pdfIn PDF document text
    • https://fishuntpesca.it/file/bonategebupewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+interview+questions+for+2+year+experiencePDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 16872 bytes
SHA-256: 6e1b183f02d306ce357f32348cf79ec6b473d0b334aa286c2fb72d547cc28587
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 11284 bytes
SHA-256: e6d538bd1bc7bff6a30dc5ce87d046347102a852af2909d769b166595e0c8cff

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