Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1cb1f0e4a8a9e0…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 00:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6974fd0bba5f57e48e00e3cba9a31404 SHA-1: 0203ff2697f37e1b7d71c7f3451b0fb0297e0589 SHA-256: ea1cb1f0e4a8a9e0c7b35859d93f9a5fe49793a5fccb208728f7a22f6945b7de
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be non-readable content, suggesting its primary purpose is not informational but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://bajajsports.com/userfiles/file/gokidetutupotamotu.pdf In PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/47295587183.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/mogimitamiroda.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f8158d0f5---berakebuvegefegadutod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a236d3565---faviban.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/94251113203.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/6064507446.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/80813291713.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/31317527086.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/rijomujowoj.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/68544985159.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/36558229208.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/63709643796.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/70851774753.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/13690462553.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/paxazadejavuriwadim.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gekaledaluzikon.pdfIn PDF document text
    • http://apicn.net/upload/files/87496515167.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461d39cca83---kexedi.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/25563580359.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/68405263557.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/49186130908.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3e835029765729ae8ea6772ed9cde5a4/pakukowabu.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/6321042675.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/64344681255.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/61638984790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+dua+for+a+sick+personPDF 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_off0000c22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22C 21120 bytes
SHA-256: b4dfd5f2217121e8bbcc310f689acbae069aef7048929ad5bed209348d5b6e51
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10812 bytes
SHA-256: d3bb5a0dba565c04413d20d17d64153d6a675cde5dbb4b6cda31e789e9cb7dcc
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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