Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6892e89a9a930f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-23 02:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd845240a0a740abc07f05a22c56c41e SHA-1: 3384f1eb6fe59fc8cba39651c6643e999303c7c8 SHA-256: 8c6892e89a9a930f1286f62f88069b1379a74531c365df85fde7e02126027eda
176 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on various domains, many of which appear to be disposable or potentially compromised. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely aiming to trick users into clicking the links for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://immobilieninvestors.net/userfiles/file/pozalusojulagebafava.pdf In PDF document text
    • http://watdoenwevandaag.nl/upload/29125708371.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902105736.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/wukefusovu.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/gimibifakixer.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52256265397.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/37299224488.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/senelogop.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/63988576117.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/26190396117.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/55110234130.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/pifelokusut.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/54571116318.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lewofitunudiz.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/9486712652.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/66183816566.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sazexupekifak.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a525d717d---44906484461.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n5cnj57vfm5c16nqmoq3fthu75/birasova.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kifapavamivodisifofagubu.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/67996334245.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210909065502_1240899602.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161418c29a2282---goxenojotur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+alchemist+pdf+englishPDF 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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 10808 bytes
SHA-256: 4fa52f83802e25cedb8989ccd0014aeb8f8f8df565e0a88d922dd080ac8799d2
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 18524 bytes
SHA-256: 4e1f1ba1f14c30a981e321a97103501e04dbfd87bee4706f88b553cb59cb6db5

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