Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78fcc4be3a5a14d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 22:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cc7939d9aa4c9a702bdbf06e7869e53 SHA-1: 6633581edfa6d2be231e5a6affc8f741de4408a3 SHA-256: f78fcc4be3a5a14d5e75f61d768e61e02d8265c21007578c523a69b2d0b33008
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 websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=1v1+basketball+unblocked PDF link annotation
    • http://newshop.jp/archive/file/12422731722.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/2652007637.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/29343584215.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/texajatekova.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/70828542692.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/begononesurinesara.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zojurod.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/potorujip.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/29491234418.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5df240bb112d569a0de110f15e26139/93245723196.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0708379001631972580.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/96836272416.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/labomibajora.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/67510444347.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pukumolugo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eaf3d0360---22850466934.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bda95ed67---98765276539.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tejariwumobokup.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109100624551373.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/6626959972.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/fomulofitesi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/78470922412.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/gavojaxixoziwakuvef.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef81fbb862---24689846956.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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 17532 bytes
SHA-256: 1583b398a39667b5ad178ffba30c1e3df9a96b38698e95e33345bc534372a135
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10524 bytes
SHA-256: a3bbdf1c9eb90fafb64c5897178758754799fb0c7c8f4e0ff7694f95240bd991
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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