Malicious PDF — malware analysis report

Static analysis result for SHA-256 337ff320c3514b61…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 07:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03a4b543257a7354eecfaccd60061352 SHA-1: f771017017f66ce25ee23dd29becb95e49e883bd SHA-256: 337ff320c3514b61f5eea68a8f115c0b7ce3a1de89bbc19bf33ff56a19fd6d3f
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests the PDF is designed to execute code, potentially to download additional payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://medvor.ru/uplcv?utm_term=power+audio+pro+music+player+apk PDF link annotation
    • https://santaclara.com/wysiwygfiles/file/fumasexe.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/91419036886.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/pesomiziled.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/gavukotutukenodegomuwuj.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/25003932528.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/vuwivogavosuba.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/46166762986.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/11380716570.pdfIn PDF document text
    • http://arablift.net/userfiles/file/zetalezubenidumo.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76240665966.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/nekoxeraradoxinegovav.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e98b4b108ff421331eee6443c8e600a/xujaximevevitopixakejod.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/pukad.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xasimupawov.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/4183787234.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/merivijuropoturoxad.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/tuzadaduguvazoroveg.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/zaliderodiduxajumipagiv.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae854fe7a---dadanogizuwavovebubejijo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/8378226205.pdfIn PDF document text
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/kirogotidixiwesimosele.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/64857589740.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/82415735026.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/fibem.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142817b0e71c---jiwoven.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/32709247786.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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 14736 bytes
SHA-256: 4d149add8cac0e59de0dfe44e64c8647e0f79692a6f8413f267c564a4ef5b0e5
font_02_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 10868 bytes
SHA-256: 8023b6af40de2068cf1ca292cc74ed1718b8905f792c5d787def6322244729d8

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