Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f26c1737aeb7ab…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 23:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58c82b8baf46e61275c0926de79a03b8 SHA-1: 082c7b71c8cf9b73a935754dd2e1ae4d90cbfa25 SHA-256: 82f26c1737aeb7ab50083bb8228e300ee603d6b462e7105f892e10c69efdaba8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rippa.pt/files/file/buvokoxizopirixenobutetu.pdf
    • https://035620126.tw/upload/greenkitchen/files/64223694817.pdf
    • http://phupmirpol.pl/userfiles/file/zinoforilarizodi.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/revefi.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97441801344.pdf
    • http://kpghomerepairs.com/uploads/image/files/xitusemubosidinazofez.pdf
    • https://dialogueinpraxis.net/files/docs/87990755297.pdf
    • http://vestmorecapital.com/images/epost/38754290364.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130817a65f2d---21719854489.pdf
    • https://svingenieria.cl/userfiles/file/panepebulowu.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d287adaa9e---mexogujowibomumejofi.pdf
    • http://china-zub.ru/userfiles/file/forefupemobuwobavojinu.pdf
    • http://videlec.be/ressource/file/dokedeselapini.pdf
    • http://g-shocktou.com/user_file/file/639533316.pdf
    • http://lasermedia.cn/userfiles/file/99358305682.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/13717620273.pdf
    • http://sayarbobinaj.com/file/12868893542.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c13cc3a9d---biwesopebaxivudigisa.pdf
    • http://gld-lining.com/user_img/files/85649262648.pdf
    • http://deurenhanger.nl/userfiles/file/62889926188.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/lojibalebezim.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/eceac68c545c51c8e284ef4606b323fb/fuwogomafoj.pdf
    • http://unibox.lv/files/text/36947611697.pdf
    • https://daotaolaixesontay.com/uploads/file/xifadugiput.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+gta+san+andreas+cleo+mod+apk+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d108.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 16792 bytes
font_01_sfnt_off0000e91f.bin
6f2d2cf81f5a10880e643901a88cf3144b2b660e7198b04df19781f87969932e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 11024 bytes
font_02_sfnt_off0001028f.bin
b7aea2650edc287fb386537a1d6c8a72740d8fd5425d2cc093a118737eed420c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17412 bytes