Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba0109c2d4f021…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 00:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d3a6109bd5b51968b41ba3cbd071dce SHA-1: c83f87f82fa462ff5403a5d9a6a14e1765302faa SHA-256: 62ba0109c2d4f0217a0aa2558cc787cbad358f880af6c50c38f5f1a1bd0ee666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a redirection or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/af8193f6368a1f2bd46e0d84352c0567/86205383015.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/facbe452519f0ff33908e16590050db5/943583745.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a228424d9b6c5807cc17272a0303077f/41881017747.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/parurirazuv.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/57335370008.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/fowolanonivakipulageg.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/93533978586.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/82900222591.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/79076d210b7fb0fe9ed2e0d8072c8b62/52773466653.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/61592317351.pdfIn PDF document text
    • http://phongkhamtamthan.net/uploadeditor/files/suziselokiburisuneripi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/40ae1e426a80b690b6f79d6b41b564b6/37604280140.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/51405792573.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54130d5e89---14455070463.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vukiselelokupebarogev.pdfIn PDF document text
    • https://abeess.com/userfiles/file/99352086570.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d114576267---97824564711.pdfIn PDF document text
    • https://tavio.ru/files/file/59812913841.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/03875afc1e93311ec3c64657b2baf090/neluw.pdfIn PDF document text
    • http://mav-auto.ru/images/file/bejenuwuvujusefewojaxalo.pdfIn PDF document text
    • http://elitk.ru/_files/28181083441.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/39528277201.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/redugaduvifidasuvo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7d565507---jevawez.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a181ec0d---bowawejojujogetonotew.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/47318711972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=disruption+emerging+technologies+and+the+future+of+work+pdfPDF 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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 17520 bytes
SHA-256: 548a6ba1fdbd69761adfd62a2fee42cca00c5e684341487ae9e535a4ab775278
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 11348 bytes
SHA-256: 67d5a369f3bd6bc9524f560c3a9fd7e1b872d6d3ac625259dc9655e39645b838

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