Malicious PDF — malware analysis report

Static analysis result for SHA-256 adeafbb716c2a6c7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 18:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bda15682ef666e03fc93f623a109f44 SHA-1: 13b197001756483fec8299d6fc75aeafb6bbd2bf SHA-256: adeafbb716c2a6c76d76d81da418c21c630a31f767e6817c6c32444ee23a7fc6
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://seteo-dechets.com/images/file/worezuxipasegajuf.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aade1d27f7---46583467193.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/10699947315.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/70483322389.pdfIn PDF document text
    • https://olterus.info/contents//files/fozoguwosogi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607098e8d8853---talagozuwasewukazal.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/rifepu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u9jc86pg130ipp00k7al5skpvn/gupoweduxuleruwogosesopib.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee0c04bb05---74794195703.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wakudaxakikebo.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/voxazabadukoruroluge.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ac89248b---rujixalopak.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/20947144893.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/renawasilez.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/094a52af011fe25d027d71dccc403680/sunudewutufetudutu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160723b6050ac7---25862787077.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/barotonedovemu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/65857546505.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/61472205143.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/17141048008.pdfIn PDF document text
    • http://01host.ru/userfiles/files/44567873178.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/betuvepobepegupewozir.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/xokodoxukevezajeraku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=peerless+fire+pump+maintenance+manualPDF 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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 10624 bytes
SHA-256: 4441e780cb1ccbe2922c3ea8c0f145714ba58c17fc8653646a84325dca2e038b
font_02_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 15784 bytes
SHA-256: 2bf7055123045e3a7dec43c48f08b5f9ff9042fbc64ab06baf2d1b94699bd5c9

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