Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f17f4a7e1c527f3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 06:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a5d25dfd1b131df58d1afb2f3d99f74 SHA-1: 85362fc04f7d303f819e6cdc31ed6438109f8895 SHA-256: 5f17f4a7e1c527f33f03add491e3ba90a8c08285594ab0986ccace4b8b52a2c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of redirecting users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=kreyszig+engineering+mathematics+pdf PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614331e9c8f85---giranilenelimavid.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/68028348470.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/wifogegolidizojim.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407927ddfa3---5761318679.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/91798203300.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/japoxixegovusa.pdfIn PDF document text
    • http://chamdure.com/DATA/files/jexuruzarakuviwo.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/80094176261.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jozaku.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/94930634257.pdfIn PDF document text
    • https://ntc-container.com/upload/files/lugomexurire.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kamesilezefag.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/28884975323.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/22925235280.pdfIn PDF document text
    • https://eclearusa.com/images/file/roborurujajatelevojorap.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/56750255652.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/donalebuviwosepemijiruk.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/80235497964.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48954233183.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kasevinizijapafigeb.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/65827027337.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/68656990471.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/49629221532.pdfIn PDF document text
    • http://mextro.de/upload/files/zepawegiwuduju.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1663c3aa1843d6351b6464158adcf3cc/sewusisuz.pdfIn PDF document text
    • https://tekmaker.com/upload/files/67787288014.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/75145314973.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_off0000c5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D1 11064 bytes
SHA-256: f5e79e2812190842fcfa0b56ee7fb097d8a4aff1fb9908242d7e90d3fb72319f
font_01_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16628 bytes
SHA-256: 13845ef84d79f3ca9b72f20c58d7a968c248b35ba94ae62886c21e475973252d
font_02_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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