Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b58e8e0d9551d4…

MALICIOUS

PDF

105.0 KB Created: 2021-08-21 14:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 172e6144dc56a4cd1b73d962cc59b84c SHA-1: b6cfb750ccbb2649248f80dfe5be00e8288772a8 SHA-256: 76b58e8e0d9551d492e9f1ca4e0b511ace12475533e5ea9ecb6fe90fea1b8292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The primary goal appears to be luring victims to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd67d51e411---62886731015.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cda7822de44---62310734140.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9d1c38b4986b9d4d02ab414b5ab54955/55261177955.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pikok.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd32cdb64a---babiv.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/36872122288.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2efeda29---lugimenijidof.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/18970054480.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nigekebaxitofib.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ecb0c2aadc3a5554288f0856882e021a/valifasasavuferewiratu.pdfIn PDF document text
    • https://telorgabus.com/contents//files/nasugoxabasoxut.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fe2a2ec1870deabfa20b1ac26300b25a/kikemosilixuvekos.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/dd3cdfa6192fcaf2ac8275aaacbe7f92/setililezaxez.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3250ebb48---bawejepexebedadiputobosi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/59669603699.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/pouh6c8244ov4t4cg2ciph3r86/26360036016.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad629114df---juzilavazivimujogexova.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c77a8f8cb30a93a33a51fd8b814cb86e/gaganisidime.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/nigewenasebojipoku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873cc4bcab7---22544916539.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/kodimizosiveduterinukaz.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xamagetokutazenobuxivu.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/5867660464.pdfIn PDF document text
    • http://abc-tel.ru/data/File/25633915003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dictionnaire+visuel+fran%C3%A7ais+allemand+pdfPDF 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_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACE 18936 bytes
SHA-256: e47f2b6a7edf0f7f41f3ad3ed70a6359447aaf0745657717cc06e56f2e73368e
font_02_sfnt_off00017b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B94 11148 bytes
SHA-256: aaf49a51c1e17ecc431c0ba16c5f23cd316c8ce121c14fda948cf83a8f55a2a8

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