Malicious PDF — malware analysis report

Static analysis result for SHA-256 1121e2a5d3ae0671…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 13:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 669ecdda93b9b780966f3aeac83c7879 SHA-1: ab7cb5ad9269257f2522c1cb9084c0931107f004 SHA-256: 1121e2a5d3ae067195f39e90de6a62aa7973adfcec55a043956ebda9e702e068
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many links, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://huntic.ru/uplcv?utm_term=english+class+is+fun PDF link annotation
    • http://ternovykh.ru/content/file/jelujakozapugodolebe.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/37884647840.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fiwosuwe.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/82223745935.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/10253109378.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/37287514896.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021992123172706.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/96384331263.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210915222256.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46934229517.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/miwezasulavirifilujoti.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/54395700872.pdfIn PDF document text
    • http://bluebossa.pl/files/file/kixetofodatiti.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366794b455c---wuwuzafejesu.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/61608000878.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161401ed943f86---23008043920.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb50515c21---44756508950.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/56202989710.pdfIn PDF document text
    • https://alpinashop.bg/files/kuxawiwuraxowepebufejixu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631250989gofej.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/tobivovenuzugedulenamu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147b7fb6cdeb---53060668246.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/jujeboniw.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/29199600048.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 16768 bytes
SHA-256: 668374474890cb4633f3f4bcdf561fa57ec874b2d88d226bf4c66ed3aff55e3d
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10248 bytes
SHA-256: a6d2a0daded17ca65bd027b1945bbd4b12d9053fb85525e60ce4f07ae009711f

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