Malicious PDF — malware analysis report

Static analysis result for SHA-256 2266b34f68d7e7ce…

MALICIOUS

PDF

69.0 KB Created: 2021-09-15 20:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62dec438cf9c503dc4694ccaf85b7f14 SHA-1: 807b3308e0f3703fc204e5d5704334e4955c584e SHA-256: 2266b34f68d7e7ce2ad15ae394488c6ce9cf52ecb9b0c22661ba764c37e85ab9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=descargar+metal+slug+2+para+android+apk PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dee5b63d---tavuguwovikaviroperuxepik.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905203248986006s88vbxftvbmf.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosejowedu.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/digedapafada.pdfIn PDF document text
    • https://irantruck.ir/data/file/1764000096.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23318977344.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tuwinulotepi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/21943235648.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323ce38c4bf---vutumurikureven.pdfIn PDF document text
    • https://yifff.se/userfiles/file/38125835830.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/surinarabemuwaful.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/75523102083.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/86201070282.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa50d850d---96192822733.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/pexamena.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wodebedewon.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/47443314597.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76680875673.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/jipapesejitisilusu.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/lipaj.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogowop.pdfIn PDF document text
    • http://a899.net/userfiles/file/72410223543.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/zitepedas.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/8986612934.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/73672773512.pdfIn PDF document text
    • 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 11172 bytes
SHA-256: 99a07318ff6e2d01beac12100a8c48adbff1a96e0db599d3d8bbfbd0e8ba0607
font_01_sfnt_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 14272 bytes
SHA-256: 3041f9115c6919771ac2151dabced43164be7234dbe159a8219b8a5292f21fb6
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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