Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc87449359d4cd2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad666561c8b073c7e7c7530a154922de SHA-1: 9af59493a8bc80b424fe34df359be5c4177a8e97 SHA-256: abc87449359d4cd2504c3663035788a85958f31e126a6e820cb18a97d0a581f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiopetrilli.it/userfiles/files/84673601713.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0368f21a---wutaledumi.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/nokasez.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/24640547904.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5480e436ec0c73ec9095fe6227963a0/60376038132.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/4256344230.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a30c8437892673a0a7d0359fdd291ea7/33276116508.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b73dc3013---18189173479.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/s5o47rl89a9oegii5o8legmc48/62343692866.pdfIn PDF document text
    • http://cosyromania.com/media/file/jofuvividoxifudesulobefew.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/935878c86d5affd3017f9aa42b643f0b/42774725687.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xabud.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lanevi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a3020b2a---37140498969.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/5602814071.pdfIn PDF document text
    • https://digireg.org/upload/malobovuseguwepix.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/wovetusovosuxofat.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/33343914326.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8979f538c93eb32f554d8dec135764a6/mepoluna.pdfIn PDF document text
    • http://computerdoki.hu/user/file/38834320793.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108150207194305.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/42193947021.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/79987103779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=patternmaking+for+menswear+gareth+kershaw+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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 16444 bytes
SHA-256: 2fb2221db0e7ac4fce883049aa25a58d19488f38f5932fa37b3362fc7ec4aa21
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 11076 bytes
SHA-256: bc57772229970cf1fb06e8bd8b85f6f503ce9492b4fcebeef8ee76b617946821

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