Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a676c561049d2f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 05:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: deec66d102cad0887e5a5d11c4511493 SHA-1: 03a0ad914ad76edadf757f8eb0cf245c37d6ec57 SHA-256: 37a676c561049d2f4949d59b85a88aaae05173bd2589618fff02fc643e83b070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, as indicated by multiple heuristics and extracted URLs pointing to various PDF files on different domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://safetyhanoi.com/userfiles/file/jegakebofufeto.pdf In PDF document text
    • http://crmrealty360degree.in/userfiles/file/figikavad.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/76806519486.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/wexaxuxosujejutasavabiju.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/ligebuxevidumakipasatunod.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/90803899731.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/62643891461.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/senenizuwoduruzaf.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/kigaw.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902051837586142.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/57850912518.pdfIn PDF document text
    • http://partnercable.com/files/demonumadaniguwipo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/xopesekidonikararapafume.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/kadabogoz.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210902123845.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889606f4cf---41284459220.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/23la22aff3d0b16qeg84ahomi5/77214396571.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fs1g39791qi8ll124u2tu6uqpi/fitazo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f42b83f390acab369afb53d20134f450/tekadupojudi.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/17558392274.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/35785136496.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/vinajofezafavagej.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cc8550a6---guteredesovebuvigexozofe.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/lofisedafusiwodofipe.pdfIn PDF document text
    • http://4darchitecture.org/img/all/63955354622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+humans+evolved+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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 17380 bytes
SHA-256: 7c39540f8f1ed65fb689b2d9422ac968bf65b75e0ac4e376895975aff007f6c4
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 10716 bytes
SHA-256: ceafaf0f9310eb9c9713a397c075374a1c73c8a47c33c9fa0c4242a9bc11efc3

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