Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e02723393ff46…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 06:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fcee65cb11c768fe1ef38db8e5f8806d SHA-1: 42b69ea8cd7e4f9d277abc24049bb2c1102ab3a8 SHA-256: 4a8e02723393ff4601234cfd0e23d2fa40921f230e8b36b5fca37f22f3429f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://harkakotony.hu/UserFiles/file/65140500581.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/47008700698.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210803_818C237C7C4C82AD.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/429dee24c586ce675bdd06a0afde1400/xotuvokijen.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fd0a9af7ff5fb5a937e46d5acda022e0/33634794579.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f7531bcbc---xofuvuxufubo.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/79591674783.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xogetabilewifofufejerogof.pdfIn PDF document text
    • http://zerosquareonline.com/file/83198727554.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210718143110.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210722221150_0k8up2.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/46138832047.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/zopobawuwakole.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/52886010757.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-27/20210627194904440875.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/78237920645.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/pazodidokewe.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/xugesadidutusilivugokud.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09805cb64---pipokinizid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59bd6479f---88147588245.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bea54b50af71b0fca6313c97674d1f37/nezowu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/naboli.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/83782069491.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/67486607563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=change+pdf+width+and+heightPDF link annotation
    • 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 17196 bytes
SHA-256: d68a0b322d739b589d91d3437bccb872647f8546aec31e936ddbc7c8df2542a3
font_01_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 10460 bytes
SHA-256: bd68fe8917f642b00d01a4a7dccecca6d143451dfe61e0c807f5afedb79d1bd0

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