Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6d4fa08a1e79a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 21:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d1bcb44ae03dd649374403cad0cd5db2 SHA-1: 41e33ca9183a045c2ba425c256e7a4c7efdb78e1 SHA-256: dac6d4fa08a1e79aceca201c0219af5b3e0624fde7e615e6447e9f1d0518b88a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to obscure the final destination, likely a phishing site or malware download. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onderhoudnlgarantie.nl/upload/file/sezisa.pdf In PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/93314978063.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/22361474445.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/83983677858.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133c803b1e82---begonegeraxolatifep.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac4522103---mipupefa.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/lisiv.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/kewivinazomilol.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/25391908623.pdfIn PDF document text
    • https://mklaassen.nl/images/file/kijupire.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f02bb21487adaf7fd12eac3556a7d3fe/47465487177.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/padavize.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/62369275288.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/87196729688.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161300075a2488---3788012444.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/56922174643.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/93930725034.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/gomunoxepa.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/fekolirufafugiwaxexuvonoz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/23388787385.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/tujivumejopejovam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unblock+a+text+message+on+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nalotipamejasidaxo.pdfIn PDF document text
    • https://forums.androidcentral.com/shIn 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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 18688 bytes
SHA-256: 60303573173091cc9f0ae7a23a4ed795bc57526a156a8e25d4995f3d43fa00de
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 11224 bytes
SHA-256: 7ff5b2611d470aa6198beb8d9ebc43f75abc93813f4d207768cae2e06c02ba88

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