Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9a733827d71c8a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 18:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13a546a8c3a3fffcf10d031e5dad216a SHA-1: a852bddfc97bb64d64da21ab4c7a74a8efde3a93 SHA-256: 3e9a733827d71c8aad0bc6910ee034595105aed7893cef33fc846361850a9921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of compromised CMS upload links suggests an attempt to host malicious files or redirect traffic.

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://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/16040429736.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c83e709b9---59507590997.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/tejaw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/201ddb9620a262ffcd04bfc2bcd8414b/wosoxasubulimoxojop.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xowaguxereju.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/40gf3g5h9p20605u5vu85om2i7/zovejisajuvivakewa.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ce43200f1a5bb22b5da4636eea2728f5/34585282897.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/siwefapituxatorekupovej.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/51576628488.pdfIn PDF document text
    • http://mcutech.net/files/lenemodax.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/67162480150.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/jozefamomusifabubaguma.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/17232554540.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6dbfb496b867550a7a56aaf97a136645/jerinup.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6771760df762ac80e3af91e68ea47599/10400253982.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/zelodoxabik.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/40648940669.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/dkau269abqkup7kphlkdeh0fh2/geneme.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5b9420b1a8f7a046eeca9d210996338b/deduzazatezofibategoniso.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5df7cf5e687a640088208a3440be2ac5/zupaguwoxigitabikabo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210531194633_636770534.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vafuvozezamamezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=leica+c-lux+2+instruction+manualPDF 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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 18180 bytes
SHA-256: 6b9ee4235428002c2dffe2a8be2ee3ab0a433fb68d3d43f4ac2be6c6e65da538
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10704 bytes
SHA-256: de1e0ee925221ede67fa38609c62732b5a2f8205d321526abe7f0947594a83d0

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