Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bb654b2d5d0af1…

MALICIOUS

PDF

93.9 KB Created: 2021-07-29 22:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 521076c5cd4afd6946482c1031b38ddc SHA-1: 17c1d4b4e0083a6b262032d5e03876e6227434cb SHA-256: 88bb654b2d5d0af1364bb821e5886d7b03afdd24ddbd5ba083344f3d74afd808
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://illinoislivestock.org/userfiles/file/53624880267.pdf In PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc0a3c090---67562682931.pdfIn PDF document text
    • https://posh.hr/files/95176860045.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/sexoxowodogitigibosipem.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/59c597d1653c79c1729f4bbd00119698/58201572281.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/19884bd48ca97ecd24a443406c8d3596/zopaluzukuviposujipep.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/61158109019.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/41254207172.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/8433860242.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/063cou2asb9lu2es2iff5es810/zezekevevi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/78b2dfe3cba6d3712f05cde850fee4a0/40917945430.pdfIn PDF document text
    • https://sealskinz.ru/files/file/gafepuzidawunalepikijepe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6fddd7b7779f7bd0061091708e00e5d7/solimojinedogirufeje.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81f5bdbb9---86298295883.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/69ad9e0908ae3db7c986911a87499a8f/fulanirowesex.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/boxarijuvavisifekuvapa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45d2b05c9---22874523088.pdfIn PDF document text
    • http://fruitsad.pl/images/file/50693535330.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b1403e09---zupumaxosusajilawewajezul.pdfIn PDF document text
    • https://computerzone.pk/file/tiwobakotixadonikelinum.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/poxekuduboxaki.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e512b8411---jumixudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=calendario+escolar+2020+sep+hidalgoPDF 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_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10968 bytes
SHA-256: 027486d50cb4c2c13d8d21be96a13fe2e841e797d98008af780265be903bffaf
font_02_sfnt_off000137c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C2 18440 bytes
SHA-256: 3b8c6270da7690d5198bd8f87d45557e8416984633e15143d0c7c3e15e9772da

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