Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf4fb9cb157f813…

MALICIOUS

PDF

59.7 KB Created: 2021-06-09 06:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 498e4a8fb47118064fe1358fd36c4c69 SHA-1: c9d9e410eed9e862b3a71ec90ffc7657ea9893b1 SHA-256: ecf4fb9cb157f8133d26827fdf085663943df70662f32f8ab21d49b892cc54e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious, likely a phishing or malware distribution lure. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9570

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=download+ariana+grande+my+everything+mp3 PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98ed6cd0d---bozibozowozalubeloxawod.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a21a1d2ad5e5aab6245e12df83e0f0ca/40428194793.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77399c840---2486875560.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8n6o6as8kp2ln2f6ginp4r501f/61470311804.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ag648chdiahmt1v8s8nlcut57/34179510853.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9904c6724ef47f81bb53281e6acb9789/35690622512.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/32085260963.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qsnt9qgtjvoqfqk1utdfurr8m4/puvesuzig.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/onpisntj0hk1sj0uur2fc487nd/lopevavedel.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0d3aeb5d6ec80d7a5ff26dfc1321cfb5/66414643742.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210521/file/16216044969934.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j35sk9oid2lgbh07u7mkdo218a/38072292251.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f6de86bb---molil.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hd6p2e1udjp40632uj6jefu97v/totujafojawutusogozap.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/13199684797.pdfIn PDF document text
    • http://soles2walk.cz/data/file/25280476113.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/38mc9da2jniko11a55e4q9qr6e/matitifexukitiwesam.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f914397ba03fadbfb681c2bed71af29c/gekubo.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 3516 bytes
SHA-256: 198caa07014e4db04ee93852610f83ce7d50861fa39b6d372677e3b12cdb6431

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