Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0784af0349b2b97…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 03:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41280830d82fc14c24200d339ac6503e SHA-1: c1b2ed48b42531b98b96805961b6f7c55e78a438 SHA-256: a0784af0349b2b97e723ae3a59dd4ed4a6c6097eddef05895ca4d3419b12504e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential exploitation of PDF vulnerabilities or embedded JavaScript to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097692356c---tepekijudi.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ap4t5aevhv1biv57i8rvcotb80/nuxokiridapomodezizu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19195059280.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1f50472ec69d14d214eddf9d2b014dd0/fakige.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070f78dcb5e0---gomanadawopizud.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ce24fde274b91fe27c8bdf81a3014d67/pofolodedixoj.pdfIn PDF document text
    • https://lemanssrl.it/file/tabudi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913c769478f---23041186163.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516044218.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/saduwigizelofaku.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/18888004040.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/76645611984.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3fb231c77ea22aa2f4071345907b09cb/tesimajimazabelomenab.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087af01736a8---18777934013.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/kududiwekefewekonatew.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9c61f6b7---jupelob.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ed165901---wasusatisad.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/71729049260.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3a76f7a4---70564588576.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea041f035dda2b087e9bb7b3d3929f47/limukibulejozo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jevexopoxutovo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b9716c788c73eb32af719d255d4bd3d6/mozumitilexosixozaj.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/272314104932.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8b55fa48---16046052992.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/xevuxijuxawoxometus.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/4030545386.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6deuo2ufo68g0s67dfse63pcu6/lexunudinakizapezijolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+flame+of+the+forest+treePDF 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_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 18144 bytes
SHA-256: 37cae33a9f7b3514fb678aac038b3a9f32d37c7fd3dde105c81a9a4fbadec06b
font_01_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 10244 bytes
SHA-256: eb1214c6291211760ae1bb54502a95792c925ce4a2046086be8c6347548c7a25
font_02_sfnt_off0001555a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1