Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a9cd2ce3db9df8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 19:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e35c4e93ca9046712b14a0fff1bb088 SHA-1: 7bda05d64cdeb86ed7ac81f97776cc70a5065c7b SHA-256: 50a9cd2ce3db9df8cf7aa49db611c0c05bc607b68dfbfd424aa30b3b8c8ee323
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://nomylo.ru/uplcv?utm_term=how+to+hide+app+lock+application PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///kuzagidolofesa.pdfIn PDF document text
    • http://chineseclothingonline.net/File/gulovodepuzuzisab.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/10686069404.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/rozode.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/xogosorozerumemekiruvun.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161397147e39d7---dagodixukufikoto.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/lapevasuzewoxapux.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/46129257041.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dupej.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/88635508758.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0cac98e312cda133b6103469a62f258a/levufituzul.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/45636790964.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061753492101.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/79794372552.pdfIn PDF document text
    • http://fnathservices.com/upload/file/dowokavaxus.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/43133712147.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/nitasugibujibumeli.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/93547419597.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/36343364914.pdfIn PDF document text
    • http://lex.tj/img/file/22007359244.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6f7fd763d4f467d9d3ec6b6917d121cf/26166167942.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/49436863917.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cfa40701---13420688909.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/boxavowatojapa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/jimaset.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_off0000b84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 17476 bytes
SHA-256: a6ae727b11b84173ae762af6b84d3cdd9351ce84b4cff91765788035bd6ad15a
font_02_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10512 bytes
SHA-256: 7a0e743fa6f86ce291f159292bb8d36179f61bf6d994de2cf7488142cc633381

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