Malicious PDF — malware analysis report

Static analysis result for SHA-256 31da33b6060c56fa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 01:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12da6e68babe813af6659ef12accb1b9 SHA-1: c4ca5bf759f40738959c9aa631e14cc88f9a2270 SHA-256: 31da33b6060c56fa6f1d62bba9020a38d90f7743cd419ea8a6cca6c2418cddfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to malicious content.

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 https://ketchas.ru/uplcv?utm_term=solutions+to+human+trafficking+pdf PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fopuxa.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/76625512839.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/gepajilatomidozuxepojug.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbf5d7bf88---zenepavesosiduwusitetuwu.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/46514640774.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zopokadaneruvopakobi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c408a68ad4---66908549489.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/85cfd3f905efb3319e55f304d0e464d0/xugajimilanikiweju.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/mubifuwekigasujenuvix.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kojegivabawotebofobib.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d95fd24bb1038c954ec7cf3233fc0928/saromefonun.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xotaf.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/lumupeb.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f58a5038---41389286089.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/wusivenomevelare.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/xoruxofikejapuvopu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/69283145590.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/12963805785.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/lanilereruzomazonoj.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/kevama.pdfIn PDF document text
    • http://husplaza.hu/editor_up/16438540577.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59630962131.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/22981529676.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108141007008575.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/94797914427.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 17524 bytes
SHA-256: 8a98210146cc4bb906ad964827620a3c80bd3d0c4c7b9347adeb88cc59c0a18d
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 11204 bytes
SHA-256: 969cc8ffc85e4262025af4a40d85f1fb253dcb650440c3a185020029bdfbce7c

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