Malicious PDF — malware analysis report

Static analysis result for SHA-256 c407899cc9a91d6d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 05:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f71c91c6b311dd5f3c9fb3a8dc7f71e SHA-1: 7a65169c487f2bb2624c910f5c25ebe6a4c5c5a9 SHA-256: c407899cc9a91d6db9dfeb4f2e1cc690781a28cf2af6344672ec4d7fb00b1059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=convert+multiple+files+to+pdf+mac PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ccba7a62---19637056829.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/14268061961.pdfIn PDF document text
    • https://adikketiga.com/contents/files/7246192587.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/bozunarubowobunekej.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346d2359e06---dapasevir.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/jagesikogomefimomana.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310bdb8ffae---rolepi.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/linosexonolowakuw.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/64563808863.pdfIn PDF document text
    • http://skia22.ru/pic/file/xibomebaf.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/96871572307.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/81113819893.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904181704.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/mopapusozuvo.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54939399906.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fapobusadimivuvuxuluvotif.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/33095248345.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/96786332260.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/71294092872.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/95475337801.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/928634735.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9b9312a2---bazudufulepuloj.pdfIn PDF document text
    • https://svltv.in/userfiles/files/82410027787.pdfIn PDF document text
    • http://jarosi.hu/files/file/jumonulerasage.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/rodamulo.pdfIn 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_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10976 bytes
SHA-256: ea9ad2088616338e1dc25b9616f665f6af9a0b452364aa20457da1b2fb4d7e3f
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16844 bytes
SHA-256: c296796482d5f153a0d90aa569a872ec523a4c8075afe117bb8ea87cd4a37d97

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