Malicious PDF — malware analysis report

Static analysis result for SHA-256 027bf1a827bad909…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 15:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3916eaaefa9b04cfdcec992ed0c1894 SHA-1: 3b891af69fc5518640dac2a1d1a9cf2a6e7141dc SHA-256: 027bf1a827bad909140de772a45496a56e9f1f972798f04eb1224708b69b1278
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious activity, including links to compromised CMS uploads and disposable hosting, strongly suggesting a phishing or malware distribution attempt. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely attempts to trick the user into installing remote support software, a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving the download and execution of a second-stage payload via embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ambulatorioveterinariosismondi.eu/file/laritavuwotiboxodov.pdf In PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/lojulumezexakivikojikalo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d5ec976f226cd146ef7b0b09cf8702bf/bimirewemuveviwabug.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0433c5dbcd---vozimewatexemisoma.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873942d81ba---33921608993.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/fobikabosanex.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/jatovugagoluseveboxozav.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9732a85a62d691da60ce92691f83c090/81899006273.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/kudobujefopem.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/31595648230.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bqa8nba0c9ao2s6975aku8ob93/kumubusoz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12f618ccd---marozum.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/90172327223.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f747ae2cb4---fataredorube.pdfIn PDF document text
    • http://ktcz.eu/files/files/55850563296.pdfIn PDF document text
    • http://surestegc.org/documentos/file/parakizozexakalamuxixigip.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b8399edc5629e51d67e92fa04be9333c/97781555273.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125626b5e0b1---97225867445.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/40699826300.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/25367343550.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xepalapaj.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/34259818699.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/59614107267.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a5f366b428785d0122c75db1ff3525d0/98402997830.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/xejabomuronene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=package+disabler+pro+not+workingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 14232 bytes
SHA-256: 5413dcac4f9c69d11af9af51b31390d6f71252dcc89b6e93d1d3c9713d520ef6
font_02_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 11008 bytes
SHA-256: 167741183fdd4685bc87091899c98b42457426acc5d5a6b6f681dc1d5d5f89c9

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