Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72d64f003443094…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 03:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f0e5f831b322b8f08ca564712b06547 SHA-1: a8e3409ee8b749da03e743cec903f6834b02b754 SHA-256: b72d64f003443094f0d64f0ab5bcf7fc1391073aeed088e017d1155e04173311
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via link farms, likely leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/25885970010.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8518d218f0---revipe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a781eb756f7---47310572992.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pirideguraxolegajid.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943e505f8c1---zatewebavibugekipizubodid.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/24374122223.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98db7af6e---90006247220.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/ligatojidawibe.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dirojusobugotina.pdfIn PDF document text
    • http://4bx.pl/public/file/53158843860.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/ladewatoxunekini.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/6208280551.pdfPDF link annotation
    • http://tweddlefoto.com/files_contenidos/upload/files/81229914105.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/kisonajemebitozuwusudo.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xesisolodeludolikus.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/15772389417.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/54216827810.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/99924536947.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14971997462.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/11977854075.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/80430423588.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161132d31e7029---62872322371.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/tasutidopenubolakago.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8e103f5f45f1b65b53fba7b052271518/puleruzevizesavexoxevid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=modelo+proyecto+de+inversion+privada+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_off0000be3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 17284 bytes
SHA-256: 77f70acca88eca49dfc9b017df72882133b1daf43a9ec467e593d1300246e66f
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10788 bytes
SHA-256: 7c07b6850a336c262f27601413b546e7d54d6001002b9588d5a7abf6de814b77

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