Malicious PDF — malware analysis report

Static analysis result for SHA-256 1421a66c8c9ee64e…

MALICIOUS

PDF

89.8 KB Created: 2021-07-17 20:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3b20ce873ebda0af3f4f118200d709b SHA-1: 35ad0eaf08081a8c888cdabc6adbcc055264a423 SHA-256: 1421a66c8c9ee64efc62500c3a94178db012ba399e987f52a0529f86d296310a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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
  • 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://www.logistiekverbeteren.nl/ckfinder/userfiles/files/73006147822.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/59189068064.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fadegopaw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ec0f4067dc08d511f67418173bf910a0/dabojemomeselamimidod.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/pogonakimomugupikavibo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d54aaaf6249baa81177cd4bab8cd116a/fakixi.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/27934797072.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/481682243c1cac30dbb816e1776a47f1/14853574172.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0hrh8eft8ov1ub57am2sp2btb7/godojebejomijidiw.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f8c3adba544d2f5e9591dfda4dc4abdf/74087384796.pdfIn PDF document text
    • https://basisnomor.com/contents//files/fisolepirodeba.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/97805582809.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bowujefemusuzefevapon.pdfIn PDF document text
    • https://isosklo.cz/uploads/42899506854.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4jqdd3egtekdteq003f4n2jtng/kugizawadiv.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/98241737706.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/vokaramipazu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/48774e02036a3f85b935b8933fc4e747/34894763365.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f7c0fa61bfec4a7891a98ddd35ca0088/jegisudupuxanonuwu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b267b96b279---basiwuwebunazavosu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/39551080333.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9d51167df---50860727123.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lored.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/t0mesekgd0i2noq3pc6q6d0ovb/zofidezamisifarawobeze.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eu4ojeugdssf9525p8r0p966u0/kowufimun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=rupaul%27s+drag+race+all+stars+untuckedPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c518a7a2bfd---kejap.pdfIn PDF document text
    • 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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 18076 bytes
SHA-256: 910f1c00da002808764935d057d5a57cab674129e90f73df0e25e9d0ef9262d0
font_01_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 10748 bytes
SHA-256: 94061518bf9179eabb0a4e857a17a51a6b682cd08113db3c2080b02d09b0a2fd
font_02_sfnt_off00013fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1