Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71f09a8dbf88fb3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 08:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d7d52b8f75cb038cc1ff1e10d5cc6d5 SHA-1: bb4b37b58af2406321a3155d8b889e3ed88e72ee SHA-256: e71f09a8dbf88fb34f98917ff24f994249ae1e8f362672b874a57391df801fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=real+car+driving+games+download PDF link annotation
    • http://www.ambatownship.com/ckfinder/userfiles/files/tozebonigogo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/87153594511.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/5758163808.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614894de9119f.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/38036932619.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0ae84cde---58839311941.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/61685756619.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/bumurideredowavesomek.pdfIn PDF document text
    • http://szcftz.com/upload/18626918511.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/66273347160.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/933b57e59ccf0dcf93d0418594bb7adc/93289528896.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d33e0d7991---pisetobaripodoguw.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/30277257084.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/refagudasemej.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/15312073518.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/kovamilipuwopodu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/82069968264.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/99059876496.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/vidafivebomixavuga.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/bebefikupuv.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/venifavebadot.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/xazijofesipumitupumezopud.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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 10812 bytes
SHA-256: f24779998cce5bbca11a7ef721589caa2635473365404e206b651bf2d10d39c4
font_02_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16312 bytes
SHA-256: 652cd9322cc4ed63b0285f5e237afca353932b765136515679b071273744e213

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