Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21b03302a53a92e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5abf2b18adcc6628808fc217f20bee21 SHA-1: 4cb1b0c3a177438eb7240cc0473bad6164cc7fc2 SHA-256: e21b03302a53a92e170fb0a0d9554db7b5ba0202e4edb36b4841f66df5c027ac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a malicious purpose. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://makeyourpartnermelt.com/userfiles/file/23126085845.pdf In PDF document text
    • https://vitanov.rs/files/janumukowirabazuwoba.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/80678232830.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xubotajizekajarowefativel.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/29944996690.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613654ec93c89---nogosadunopariwonini.pdfIn PDF document text
    • http://aven.su/userfiles/file/6990970782.pdfIn PDF document text
    • http://klaaswester.nl/img/file/zewenugujuveme.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec75882d0a2c37104ee01f6c951add16/xajajotudifodogexax.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161341a46e0ff1---27342366662.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d922d60fe83051808774c888d1ec385a/76573075915.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/31082367956.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/10412310348.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/tufon.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/midatitera.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615034a89b8f8---jijano.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/15358150446.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/97740823946.pdfIn PDF document text
    • https://marosme.ro/hirek/file/punodetazusedakepibu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/88ddde74aede4157a3438cfa0dd5bb10/juxijava.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/52877555535.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e01bd263cbffd1e1fecc4e438ce5c799/mepozugarazu.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/50386840603.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xetujifal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+hacked+client+freePDF 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_off0000b03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03A 10368 bytes
SHA-256: 5197c790123f51eb8022d3558ebd3e5c687ed361f3f3e8883e23962415cfc1e6
font_01_sfnt_off0000c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 15788 bytes
SHA-256: 9e6553f70c16f2898f43082c9072ca369ed2542c1a0ca03dfa0a5fc653e4ea35

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