Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09aff6a44eed94c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 08:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 915a3c1773bebe9932ed0c8ee5177e7a SHA-1: 2334992df28f53968948627d012215fc26abb71b SHA-256: b09aff6a44eed94cb72ef4d8186b65509ae85973ebb8c45e48cfcf7f5812421d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://mynigaoe.com/upload/file/20210509144736.pdf In PDF document text
    • http://oecschool.com/userfiles/file/tinelenob.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ohm9588gvc27ivtfr3nius4j4h/26847872966.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/42680188185.pdfIn PDF document text
    • http://vizcsap.hu/files/file/82087844459.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76bbfae746---nalefibekasutefu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6abb0bc5165fe30b597728b1e1530236/mozufesozofu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/91053736141.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/pabex.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cba79a38fb5ef5141dc887bf7c646cb5/70269760591.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/kisutezirugivameg.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/78055380351.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7d6cca6b9715716ba74a16164af47653/46607556458.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d5f7a33c---dawizavines.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/43749677310.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4867059998.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b6dbubmlhgr3htjiidof03utkh/xozidefajufujefakabur.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4is4er66l2ep1ir0olav14loo0/zujogaxuteteveniromejija.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fezixuzutasukizemuj.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/21386842211.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/binodiludodetole.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/wodorukore.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/sakeza.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/80583290924.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbb4b51fa6040e1dd081ab45563813bc/laduperudulazapafisakukaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=contamination+of+food+pdfPDF link annotation
    • 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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 18292 bytes
SHA-256: d82f54ef0e333cf8664308dff26f5d0fdd62e9c08c40a1ce1fadcd959e989708
font_01_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 10244 bytes
SHA-256: ae9c48d1c2b83e0da3af349b5df4aa87a5755d01f4c2150024f604f74731afc6
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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