Malicious PDF — malware analysis report

Static analysis result for SHA-256 187e0c494a841d4d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 15:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a21cd0f7446c15258b98904aad2b1f6f SHA-1: 74070a518e0384fd008dcdf1045b98086f2734d9 SHA-256: 187e0c494a841d4d4b96519194023824f55e442538cdf7948c9b9befd29bbc4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest an attempt to trick users into visiting potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://kitapkapla.com/upload/ckfinder/files/vawikubapi.pdf In PDF document text
    • http://dotykbylinky.sk/_subory/subory/13883704473.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/18850678494.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210917_9A58ED1CA54E2C7B.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/77703370513.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/76168454130.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/vizonadefarapivemuji.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/xejepaterobafogab.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/68467620842.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/tifujor.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/47351389400.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/37365283265.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146869dbb0cc---tipesulemarejedapexudugar.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/8060425205.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161412b695441d---75709630192.pdfIn PDF document text
    • http://clickvay.com/upload/files/90751492510.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gapegamuwuva.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/geranobuxofajibokizim.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/33390954164.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/93555611660.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134004c5bf37---judapumavafovigivitola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shylock+mp3+song+downloadPDF 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_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 16912 bytes
SHA-256: 6674d29408ba9ecddc2e5ebcdb36f7d047ba60ddb0c24c1efd0aed2ab9bd2ee3
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 11080 bytes
SHA-256: 209899a0adfc73538581fea38bc46a4e2f27a64a612b28dc43d5d5c3c9ac46c8

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