Malicious PDF — malware analysis report

Static analysis result for SHA-256 f347ad1c00c92d50…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 21:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08732e540182143dde8bc9c57a10d42a SHA-1: 39676846a764979803e053479b5f9785522ecad6 SHA-256: f347ad1c00c92d503031ceb3c93412fbd0745a740572327f33a00f0beaf808a5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to disposable hosting and compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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 https://kingwaterpure.com/ckfinder/userfiles/files/lonelejozenizevak.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/84049268068.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/resinaxulegemo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/95536562559.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/32117937552.pdfIn PDF document text
    • http://momsystem.ru/public/file/lixojopekojunuzobofimolas.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/23592572036.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h1k18brti6mkm6vgd82luqv0oj/29372279922.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b98501b23---53480212005.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f478a7b377c155f489e0837ded32837a/12754911013.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/21409094916.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qsct32eqj949klt4he3hpnma9k/tozijusapuzugorawedit.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/70492752126.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/xerukemeferexuj.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/f8fc63429ab8b9baebb821c8fcaadcf8/17195121949.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ctcobo7h1srjsrc2smscjr3j03/piseterajifudirakumu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9232b06713---zolusoteregodivuxejav.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qsrhv32ficuidh5oaot6c4s1q0/wuxezotesitijarawunid.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/bawasalakarinilitumozegem.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb04c4bd3---mapekiwukafaveroxu.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/82991679179.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/14293607513.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609021b8f338a---4935252513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fce+handbook+for+teachers+2016+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_off0000b790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 11248 bytes
SHA-256: 314925ed21d84ef02a9a59a8b4516ffc2b3f8a11b64088439612a3a26511ddfc
font_02_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 14988 bytes
SHA-256: 9c684d33dfde9bb13acf1db1bf2a0e28b2a3f0be209ee5300197a674378fd0d9