Malicious PDF — malware analysis report

Static analysis result for SHA-256 549736af751db41c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 01:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44a446c1f17940a1274927699262cc7c SHA-1: 7da0f88a2b3db5ba104cadfb217640ea064c6082 SHA-256: 549736af751db41c1750e412043e2c091b9abfb873915ed831b35f07ddf1c4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=vidmate+old+version+2014+free+download PDF link annotation
    • https://igruppe.no/ckfinder/userfiles/files/8645207704.pdfIn PDF document text
    • http://puisan.ru/uploads/file/64685269532.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/96891972152.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://e-junghan.com/userData/board/file/lipotobemu.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/nonegibu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/guvakexego.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/58042865622.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/zewamakepuxajenenodujuru.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/godifozozojatagunopaxowu.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/56816599789.pdfIn PDF document text
    • http://kbchina.de/upload/meramuzom.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9c9379d5---78554853325.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/verunawiponaw.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/gipitubekunaxivi.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/72903038912.pdfIn PDF document text
    • http://kezmosas.hu/files/file/ragig.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/78114486607.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d921c614c283e265ed89d0f4cc8b6830/juparexuxasepi.pdfIn PDF document text
    • http://megalaserasia.com/upload///55347768852.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a176669c---65917644399.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pkoc3i7b3j8dedgscvkgc79834/gunewuwuridavizelugawer.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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 11008 bytes
SHA-256: d42f012506f1718bfb5e38620b626a21d3b4673789149900f92c1c0cf41fa100
font_02_sfnt_off00010125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 17892 bytes
SHA-256: 30a4c9084386dc9748ba8ec5664dff45550d46eaf0b125d4bedfbaf723d5e882