Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7210e8e9266f75…

MALICIOUS

PDF

101.9 KB Created: 2021-08-03 13:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15ab2125978043f03d039a512531c57e SHA-1: 22f478e6b145553e46b10f5bb65519160bd64546 SHA-256: 4e7210e8e9266f758148067d9882bbf0c4ee0f08d6e25b15b74f0f42c58b251f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits multiple indicators of malicious intent, including links to algorithmically generated URLs and a link farm pointing to compromised WordPress sites. The presence of a 'download button' heuristic further suggests a lure to download malicious content. The ML classifier and ClamAV detection strongly indicate this PDF is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=grade+6+science+textbook+pdf+tamil+medium PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079900917765---67601164962.pdfIn PDF document text
    • http://unseretochter.ch/images/file/nipagemadoz.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ravogavulukuputuzukodine.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/91i917fc598mg22vfrlhq2uvb4/kekimozegirade.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/n9cq49044gvcnl7j4l71ephvt5/25585009747.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/rokivi.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20690032993.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/94365705814.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b1c9fd4457ffc31649c16e50c7cbc09e/71890618098.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5e84bb89---17544821987.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/wezedor.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/34c63ca8048230121b2540bf12566fd3/83974746033.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/8199181634.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/welejutu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1ad040f179c4da77de949ce26934b1a/bojijixumelanafe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ic9g4k32v320ik3vuhk6ba5324/lemubelu.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/ditidiwi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9gp33fp9qbsn3hb37qogijoq86/84935813616.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/opojp9mnclt8a1g4t9lc4rj1gk/wubakobi.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/5380647676.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/vugaj.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/mumafewod.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a8760e8afdded33a67e13366c0857355/zififevakugimefel.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f7d49918d---vowunusukofiwi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce8804eac---lemelizimojemonosakudizaz.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/8767606439.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_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 11424 bytes
SHA-256: 32b8d9f0b8af0e81fd53381ec8c91b51c3d01266643f05796cd1b4acc9432371
font_01_sfnt_off00013eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB0 18192 bytes
SHA-256: a477644414bef43e171dfff045121bd4e2fd221ff035bb3417204e31523227b2
font_02_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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