Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f229cabcaa717a0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 05:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: faa138095a2930d7d2399a9754157ed8 SHA-1: b56e65efb246baff2be2f62218766b6957fd5f8b SHA-256: 9f229cabcaa717a0076e24288a44288f8bc8a5658cf2673115d8276ef2b8ec74
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://100tmt.com/uploadimage/files/20210901095549.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/53909639164.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/21816070221.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/10224787459.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/32074933377.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/38280008760.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c227aa3cbb---wabifagugivejizu.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/20980537780.pdfIn PDF document text
    • http://minipit.com/data/files/rusuwewomo.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/30846279063.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dazim.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/88653116779.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vimunex.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/81670813803.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/40514207844.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/mijozenet.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/28c5935b0618fd63a27eb453850ad5dc/8065361570.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/ditawimeselamuzejisez.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sqm95mqls1t6qbmpl0118oqff1/wipevopixedugomog.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/jifexorovuz.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/14041651245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+screenshot+on+iphone+x+snapchat+without+them+knowingPDF link annotation
    • 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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 11148 bytes
SHA-256: 67e5a74416e963de4a1ac0fd38515eb5eddb59c3c0df01dab5f6f91d00c4e22f

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