Malicious PDF — malware analysis report

Static analysis result for SHA-256 911036a490f52239…

MALICIOUS

PDF

77.4 KB Created: 2021-08-07 01:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6ed2e055c073ded9d6f669cd267bf43 SHA-1: 111c86069b749eb70efadff26c9c18f1a715b4cf SHA-256: 911036a490f52239e02a9867d6be9b446904bb0454a73282a125782dfdad8084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it could be used to host or redirect to malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://autodilykanka.cz/cmsimple/images/file/dajizofop.pdf In PDF document text
    • http://xnucleus.com/members//member_images/files/fudowedoresipatuge.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/fubeladalamifevevuv.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/53776972716.pdfIn PDF document text
    • http://policylic.com/uploads/files/sixefitagupewo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2694dc5251e033a5d317598595f5cb1d/xinesodameju.pdfIn PDF document text
    • http://yuha.be/_files/file/44070516393.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abed7142f03---durofalarigamonixur.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2997db3fff9dfbd34fbfb223665b0b06/roxirizuvoguwija.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/89016967832.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/92938820922.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/tazewekat.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9grl70ta9uucgdmfo06gr790sm/48741105538.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a15e050a86c2ef770ea00d7cb4586ed8/vavejoxogefix.pdfIn PDF document text
    • https://banghenails.com/upload/file/89406490.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb699882732---76408697542.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/renukilupulili.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/40162309791.pdfIn PDF document text
    • http://sns.hu/_user/file/rixajibabebaza.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/76276279019.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/zefijavobitorizifomariwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=skyblock+seed+for+minecraft+pe+downloadPDF 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_off0000c876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC876 11288 bytes
SHA-256: d2397fe169a9c0775cddf5274459ad81f5a56b9c4d887f3b857130c3469ec21d
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16620 bytes
SHA-256: 5f288ff0df52c805126742af8f2cf26db206524e8620c89600854ada070251cd