Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fa13c0d5e98f58…

MALICIOUS

PDF

62.3 KB Created: 2021-05-29 06:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dd50af5555f1c7408d5c9749d09bb2b5 SHA-1: 8e4af5b5b655a5847b98c18c5b8e4c012178b6c4 SHA-256: c1fa13c0d5e98f5825a51af8698bcc4f22cecc5451fe87bd70cd47cf6246c55b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=sri+suktam+tamil+pdf+free+download PDF link annotation
    • http://tai-yang.tw/taiyang/upload/file/52018536647.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ae693665c---36043444691.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/jenufuxawitugo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3679ff8dc89416b9dca01aaa3bfe285f/13509425529.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1429f67ed67b326db5b21abea7530853/74023587022.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9a7bbcad0efcf105ec970c0515545750/84885145487.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5444eb8ae4aa1ad824092368c80822d5/gafugeg.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f506465fcce9fb0f620495079621b79f/mitamim.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/58715512717.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eafbff6d---38454008736.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b3a1782c41f06f93d32b464e8a6b06c7/47106336799.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/fapozereru.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/833b88102c4336586ffc5998657182c1/rinasotagopowi.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/o4j4a7l5du2d1sm6qkokrh1gj5/fidexikebote.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/8vqgp1alr9rpu5c3trfnp2oceo/wonumumegatigon.pdfIn PDF document text
    • https://hirurgija.me//files/kenunomiwoseve.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bada20a727---60015974900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 5448 bytes
SHA-256: 8a26857b6310a73c340862dfe690d8dd3ecb7924df082cdb731ac92d313388e8

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