Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eb5b7177a1881d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b253346679427ba1c4a338997ff8fcfe SHA-1: 123cbddb7fa1a4f42cf40053678d7443ceb7e2b8 SHA-256: 87eb5b7177a1881dc9990f7fa247c226da7c65cbfc2390beef0e3d56609a8cef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wonderful-foods.net/userfiles/file/sugirofagibibujemar.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2m0euk63rbh4ntmrgbjdt8ohm1/fisoxadadokif.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/15368393631.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32068911627.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/nemisudifadejaludomanuveb.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/kugaworofib.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418c776c98b---36961384213.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xovavoxezikuwabosi.pdfIn PDF document text
    • http://belovosushi.ru/files/negogoto.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kiwagojerodibifefogegul.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/76207143147.pdfIn PDF document text
    • http://jadeite.ru/images/file/xuteduwig.pdfIn PDF document text
    • http://benetalent.com/upload/files/41678948702.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/813324281.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/musikekerode.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac23b202b---latujabisivibaduwube.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/75963604463.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/80760105803.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/57884594302.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/91701069193.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/64542237134.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/45894167126.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/setulukevemanaguku.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/venosoxopa.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/66931602218.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vadigigosixotoxex.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21d09ddb3---titojogapise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=m+active+apkPDF 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_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 18108 bytes
SHA-256: b35cab07b3ffc0ba48fe0913f5fd6f725a828910cdebaa1af08952aad5f6e0b6
font_01_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 9980 bytes
SHA-256: c7d72b5e31ad608796f854564d79bbf79eafc78ca5f83d7a6027133ac9b5ac62
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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