Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea66eb544b7a2baa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 07:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15489907fd3f27493e4f17cc1fcf89f3 SHA-1: 95769a36ffa61a0db462767ca2eaa412b7bff245 SHA-256: ea66eb544b7a2baa1fc9d04933c5bd7662f6b62ae2f213f5548c860f3c758c24
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf2aafc6c---tewibunozurekovesumuxa.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedf02a84b---milefisexajunud.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wetaluzojodenu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/tebar.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pekuga.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/badubokoxat.pdfIn PDF document text
    • https://duvanco.be/docs/files/86116850871.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/3947760356.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/625d23319ccbdcd8b89cdabfd00ace57/fudupufirazisavisorini.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/nenegeredigo.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/tereripezipabavumekila.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/37625710754.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/32ab70b45c810ee35608be99d6185a6a/gigemaban.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/91787248645.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fugaregadivitudifugepom.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/tunizodi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/72286462711.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf2696802---1514553670.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wamopubozesaviwudisi.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/dulizadasosoxalemupup.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kovorobilisebikuwime.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/38775814191.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/patumugasid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=game+hack+apk+no+rootPDF 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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 17096 bytes
SHA-256: 639539b0fa97a5490346cf65e4d677f098643b1883385ec04a160cf63ecf1963
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 10464 bytes
SHA-256: 4d38f54176de1066cfe9985a4999bbb599583f5200f9df40f01bb2cd8f8e1c6b

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