Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a3243c732020ca…

MALICIOUS

PDF

75.6 KB Created: 2021-09-29 09:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35f511ca2df2a42483f5e55fab09faa7 SHA-1: 87bbf77cb1cfc9fa6d579c745f57f884fdcea17a SHA-256: 54a3243c732020ca320ee26c13e5897f952410b0f53c918c91bb85fce93aebd5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, designed to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and link farms suggests an attempt to distribute malicious files or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=como+conseguir+claves+wifi+android PDF link annotation
    • http://gocoachfox.com/userfiles/file/parilozanatutuliluj.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/waparu.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/raturelu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/19863496088.pdfIn PDF document text
    • http://makaroma.fr/upload/file/3595698865.pdfIn PDF document text
    • http://a899.net/userfiles/file/pamufakogokefabefot.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/lokamosedu.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/jejeparatatumoxiru.pdfIn PDF document text
    • https://latework.cz/soubory/zadilatobuxisa.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/75559262497.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/88881528982.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/govowixaxaboduniralubosu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/94428664457.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/xevisozefizewedesijuzalor.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/13299765082.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/gisurinekikolipatexi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1mivqm02igb51um1ftntbrak26/vojasiwujazi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7446cf58---sixilixenabawunew.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/segojozitixanefuwukafasel.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rupaxogawefepojimiropozi.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/41995270696.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a491e937c---49612054132.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/36998456253.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210924193232.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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 18440 bytes
SHA-256: 8937990bdd8582023992dc1e418d09906ca6aff1cb981e53703f8e77b3a9c420
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 11004 bytes
SHA-256: 8662500220451da8c71c2d63ea04c6a49351451f812db4979e0899a1bba0fc5e

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