Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fd16951c8716e2…

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 11:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c439a5b80433741c07d6934bb691da3 SHA-1: f7754b67f1e1f5be11bf1f7ec9567b9f3e137101 SHA-256: 74fd16951c8716e2dcfd68ceecfde65e4cc6bcdca294d8bdd2786c72d0e1d70e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to various domains. The presence of PRC/3D content and a high ML classifier score indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://synerhu.ru/uplcv?utm_term=fire+properties+of+polymer+composite+materials+pdf PDF link annotation
    • https://twr1115.net/files/fckeditor/file/regisuril.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/gajudogovileladidosa.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/mimigabojuzegamigob.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/kenobodenozurolesi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pexadedupakopu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sa4fj7r7cm82k4rqno8beok0on/19503343180.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4e872769---gifolevepuxe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dba4e82f78754138a5c91269d48eefa3/86114470437.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32739683005.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/4041958829.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5bb93c9a6ad0d2d7680bac40f65674c7/kavetegarem.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/13f301587048dc76575d55dc37180798/bemuwifexabekovijiwukirip.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/15892124708.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/wuzafatakofe.pdfIn PDF document text
    • https://songhong.info/userfiles/file/zitisuj.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f7c14286ee2f992e8b2dc4aa98cc4a2e/28973792298.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/butikapeweb.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/47840459050.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kujimofaxa.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/dumejijanipum.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ff34dad6---36457060328.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9825d4ec0170455d5efb2ebddd86c38e/xovofoz.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/pefaxol.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_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 18320 bytes
SHA-256: 8d625ced4cc9984a00f7488bb82d6402925cbaba401341791932cec28e9879e8
font_01_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 10768 bytes
SHA-256: 61d2296f09ee83a8d89c8da70797286df0290d84eafa41d95261ef1b8d731742

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