Malicious PDF — malware analysis report

Static analysis result for SHA-256 5706c7c7987f5e29…

MALICIOUS

PDF

106.8 KB Created: 2021-09-09 17:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 46ece2a3ef2b8a32d2621c7bab100925 SHA-1: 76beba14257b00104c6643284fbcebccb872c1cb SHA-256: 5706c7c7987f5e29310216fc51805ffb778da916f3b32e73e39ee37745cf36fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://krevue.cz/UserFiles/File/39056675531.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446edb674a---lilosesetirafi.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/puvebiv.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/60413665260.pdfIn PDF document text
    • http://svx.su/ffile/file/2478621566.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/vesurudilisufarop.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/12618707962.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87422502041.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///nexifafibum.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/79109583606.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e234b1f90---76757734730.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/melipifekak.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/sonagilixugur.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/16928373049.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tilakamosoju.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/11306179692.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xesoxetutelupok.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/96161681936.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/94877241399.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/dubekimipizi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tobofimom.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/15118254574.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c09118c1e---nurozowodiwavivizoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chrome+os+android+appsPDF 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_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 10544 bytes
SHA-256: a3074dfecf09b8f014409f71412e5d7d08274a0313a6760c34008fabf6130d62
font_01_sfnt_off000153cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CF 19168 bytes
SHA-256: 96b6ef1613c31b2c5f366f658d1c702edf8f1ba107421cd11a5ed11795375a1c
font_02_sfnt_off000185d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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