Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74caabc2d2388b7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 22:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2553ae08dbe63fbac690d5836aba32a9 SHA-1: 18029e7d9a36eff6b94903bb1ab88f2a7b387925 SHA-256: d74caabc2d2388b79f8628f7ba5580cdd89bc269c7254cbc002eb782c478584f
176 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs pointing to unknown or potentially compromised domains. Heuristics indicate it's designed as a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The primary function appears to be redirecting users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://phoiinnhiet.com/images/uploads/files/pesizijobewarirojaga.pdf In PDF document text
    • http://oishisushigd.com/uploads/files/moxev.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/30893155483.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/47711814047.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea05da184c---nazizojagomebo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kepugobexivusisivupolure.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/35449227.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/92513241580.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/papinorimefumurizazaz.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tokipivubutipofikijedis.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/50396024906.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
    • https://cityface.cz/res/file/wonerisebakigodifugijuku.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/9376507098.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/853552381.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa1d5724c---mujifekobarun.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2ebcca44---nokitapapefemev.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/puvoxuwawew.pdfIn PDF document text
    • https://goodline.by/userfiles/file/mapam.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/toniverawopuxoliresam.pdfIn PDF document text
    • http://zeci.nl/im/image/jasitenawonerifubane.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/25623744408.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jowiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=freelancer+com+reviewPDF 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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 18476 bytes
SHA-256: 740dfbf58e3dff4884bdba6fc4f8e0e7473167cd7b2998b65d8d3e19f33c3320
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 10256 bytes
SHA-256: 05f54f98251af1464d0d30d41624d64634ae8f280c87445616aa5c57c4b34175

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