Malicious PDF — malware analysis report

Static analysis result for SHA-256 f468ad470286208b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-24 23:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6270bd78c0475dea04eb4e5cfe52a38f SHA-1: 92e91c3c16b2eaaf6da4b881b627c95c40b834b4 SHA-256: f468ad470286208be18ad8fe31453772f10d248afd35e680aef4e4b9ba20ceb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites hosting further malicious content. The presence of numerous URLs pointing to potentially compromised CMS upload directories suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091097303364---jikuxuzojojopuxevaxik.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o1t9otfov734o2lnaq2hkkjt77/46545234072.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fewugukiberiruvixok.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da298a29d4---tabomojowiregazijobesa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3114251705---lixekabibizi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d46eef09da---vesuve.pdfPDF link annotation
    • http://mrs-edu.com/sribati/editor/uploadfiles/70177950201.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/54931931845.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/31132247906.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2bbe6937228f4d6b85d939059db0114c/julozejegomodipesare.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/74494579134.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c939d229---gefujiku.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2bdb577b0---45596399244.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/1751251383.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/pegenuze.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59a9803fc---2375195802.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/tojegebibawuti.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612554bf64e81---gobozowuw.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/zunududoxef.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/fevikagajem.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/ritoker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+dunkin+donuts+iced+coffee+mochaPDF 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_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 18424 bytes
SHA-256: e88a9d1586de19d2f76784b268d1c8fa4de6e07206f6f7215aee7d04cefde612
font_02_sfnt_off00013031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 10864 bytes
SHA-256: 4227743bdbbdb19316281b6d29b4feefc88b747d420a547458f38b8d30c435c0