Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea635ac860c015f2…

MALICIOUS

PDF

81.8 KB Created: 2021-07-27 03:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03961c346b7a0a4f9f830307abac2ced SHA-1: 6415a8e48b2c5f9912075670c35f98518acef8aa SHA-256: ea635ac860c015f26f7ad748e8e9c7e271d1a7784d301d0bb3d535ca22d1414c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, but the presence of multiple PDF URI heuristics indicates a strong focus on external resource delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4855

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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://curry-box-deluxe.de/userfiles/file/99664128084.pdf In PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/5013119387.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/53595d61419f938f071a86bb4451e11b/40554430432.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hst7vgs8q3k9aqgb16pt80qoo0/67727634307.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763be8d3a91---xifidevutizun.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b675597b00f---lijasuberedoboduzonu.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/21680127654.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/zatiropinedofexoroma.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/80649bd7fadd7bf5c424b85ed156ff0b/mulazirotaporumi.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/gusovapesesovutisajitozo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf92c3800---13377244894.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/losaburuxitiruloligopo.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/54284222938.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/72357178496.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/9ff7s2gire1g84n8u85ncqt5m2/mafewatupuliba.pdfIn PDF document text
    • https://medtek.vn/storage/file/lovodovopilug.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210607224735338.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af6c7517f---11069880099.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/xemiputenegifokomikat.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/k829q4usl2uuf4pi3gvo253nuo/79735063121.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157df00846---lujusamolimupetorafuna.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2ef38f4fd225989bfd0467fd5db1a376/90365706652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=certificat+de+cession+d%27un+v%C3%A9hicule+pdf+remplissablePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b7d80eec96aea83227cc341009448050/disivudunavebijagixepena.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 11408 bytes
SHA-256: 2bdf7120f57bd613bcf8592e55b2f3359a05da445cad464b5bf078007d920786
font_01_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 18184 bytes
SHA-256: 1ade1dd051dbc01ae9a65df838fce0fde9dfa00265031a5382323a5004ec6436

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