Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f124eaecdc0123…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 22:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aed08ea65fa2fbd5a6fd48c72a1ec260 SHA-1: c03e31fbc4182ecdbc639e95f880d5d5af61b5ba SHA-256: 63f124eaecdc01235697a48411554e514ed132d936cd720d6765f2232a44f20d
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised websites or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=veer+bala+rastogi+genetics+book+pdf PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33347242aa---61870526262.pdfIn PDF document text
    • http://esejsc.com/upload/files/dokijopozezubiwukup.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/96549731536.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/jemelilojukew.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/13356223473.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/vopaxufuwalekogowis.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210727184746_1281435535.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a9b2f79d974f54a8774396a977779b3b/sokubedalojuzax.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/zitujopipewagele.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108871fe4812---leref.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/75507751911.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/ninonivaganazi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3f24799bdb997b7b9f3b8150795683b5/73396151980.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e91d6a39---63729269214.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/witeli.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/67856294172.pdfIn PDF document text
    • https://udruga-invalida.hr/files/pimamelakidaxawin.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/nupiwefodasozujozutaxo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/145be149ab3f031521617355c6ffa7dd/54211085342.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ef0aaac65bee2edaa646f81a82950e44/jagojutal.pdfIn PDF document text
    • http://wwstationery.com/files/file/tulozafemum.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22553534715.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1e54e2dfa---31448968809.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/korojun.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_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 10996 bytes
SHA-256: c4dda8b2d30d36c42175c9beef0599ce0f743174bcc9cac501927ea273d99e92
font_02_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 17196 bytes
SHA-256: 7ef86d434c19f02a37edf774b0977558e6ec77c91f734b0214208ca44900a11d

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