Malicious PDF — malware analysis report

Static analysis result for SHA-256 42931aeb49d39423…

MALICIOUS

PDF

71.9 KB Created: 2021-06-25 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f39b522049490707e71c1e92412e7dfd SHA-1: 3750014512f1a0faa578f1b9eb5947fca991cbab SHA-256: 42931aeb49d3942307ded2d414ee984fe1f56ee87acd02140c0f65550b0988ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings point to a pattern of hosting malicious content on compromised or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=how+to+respond+to+what+do+you+want+from+me PDF link annotation
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/wonufoburalejidew.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/mipujivetesorolozeno.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mininuxasixetowilag.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3c890d49---fosagezametesaladawa.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/8df1796be1d88c4c00f1107d9bdb7dd8/jevujenidefisojadadav.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc399a85711---6334251650.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc202fcc8---dunovatikosedozo.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/34842535349.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/wadolesexutijilaxup.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aaf3837f6---50950258228.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94520370183.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875bea2954---ruzenewap.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bccaf644---fipuzaminikux.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/96694846773.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074979e26914---vubineruli.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/59261278079.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kenukatazesomerubabogipob.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050302383173499.pdfIn PDF document text
    • https://artbynela.com/uploads/file/41182951395.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/mukalonurugu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/86672719133.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee8a51048---51532306907.pdfIn PDF document text
    • http://derma-dts.de/files/file/dawasirexupaxavigusivusur.pdfIn PDF document text
    • https://hagepoorter.be/files/files/povanegebunilufobevesegaf.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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 15128 bytes
SHA-256: 71811b4becafcc9eecef7a9cab47ed0678e3e92305f32e00a3cb5e8b4de909f7
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10916 bytes
SHA-256: 80e799c6c3b21dfc1d7d067844a1f55ff0a8bb3a03c7fca94d7a06d11a0058fe

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