Malicious PDF — malware analysis report

Static analysis result for SHA-256 40af501ccb05bc1b…

MALICIOUS

PDF

171.0 KB Created: 2021-09-05 04:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9484ecad15b4ca181c1692a1f16dfeef SHA-1: bc6338e21e497fc36dc5bfdc754133765461d69c SHA-256: 40af501ccb05bc1b1d5343a562b54f39ef20eb4d7eac8787276d59294e3e1927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://learnersdigest.org/userfiles/file/78087528608.pdf In PDF document text
    • http://kutyasturak.hu/images/files/gubavevoxorunusexedem.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c102ed7fa---ruriziva.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/gujoxumedovukuret.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/tawaxaguvaxovapodepijim.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/192eb0d695c426ef3fea30d5d5ee9a6a/mosomijojuxefedeji.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/aln2cp74hh4funmca7rgvdf2m0/boforoxozidufodokunobekuz.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/guwolizejuruv.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fl4ggl0ogeo3gmv5vurl5plujj/43434018304.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mizeravemanunusuki.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/73433121804.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1629728070433155982.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a1c9ba37d0a01fc5539ae372918543ed/95355604477.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u3527o469skfo4agtd9hb0mpl1/rekewimelane.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/waxuripamijog.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968306d1724---xibedesajipudinen.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/jodazesofuxifo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/nojabazam.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb7e068e5d---padizevolexujukekasiruzut.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/9344654002.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/potevilogido.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/79418711726.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/runuzafuzasuvomudugifemil.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/52498735825.pdfIn PDF document text
    • http://mobilenmr.com/files/files/19750889763.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/in3qaa43m716b6l4e9mkbljtn7/7377752615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pixley+ka+isaka+seme+speeches+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_off000240a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240A0 10772 bytes
SHA-256: 47ae0d754fc1b099b17a74ca69ceb2de9a555f9fc7c3595161257f3ec932b18c
font_01_sfnt_off0002596c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2596C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002717e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2717E 17020 bytes
SHA-256: 3a0e3bb737f5b0c481bea509a9f90931ff0b172b3e2f66d5dc1583858ece8c35

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