Malicious PDF — malware analysis report

Static analysis result for SHA-256 e899faa1e515a96a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-24 07:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93fc94ff6a14c13c092cb029f47bd78a SHA-1: 7c0e0c41ac75454415b88302b7cc8b09a7a30c75 SHA-256: e899faa1e515a96a1e77ac0420ea42fc98adaeb7f15ff0117e2244d40d409641
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote support lure. The document likely aims to trick the user into downloading and executing a remote access tool, potentially leading to system compromise. The presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests a phishing or social engineering campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=escritorio+remoto+desde+android PDF link annotation
    • http://donkaew-furniture.com/ckfinder/userfiles/files/71426737047.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/13701959763.pdfIn PDF document text
    • http://btfa.tw/upload/files/43280165661.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/42491596479.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1858bd770---98176213299.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/dofexosowunis.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/1359171208.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091115062873499.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/zifaj.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/xorufafupekotazebozilo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/48f2037d70e84410b4061105bc14e1b1/54018701395.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/domututoromosexi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1f8514581376dc3aad6d2db430ee8109/lulitinewo.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/4645415616.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d182ae6133---58000272358.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77173949479.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/delimodofisenepaminutula.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/toxutirok.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/16688516324.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/sepexuvevam.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/fonuzikum.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/53750812870.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/redoreji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b6d2534---24759692927.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/golafajowefemolavodekatip.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/20108556807.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 10468 bytes
SHA-256: d8a89394aee67d06f3c66e9035a08b1e7965c657922711057568139bb77fa6e0
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 19236 bytes
SHA-256: daaf0aa66209328e4833ba38fd0036725912b884e39be9da48e7062ba0b720b2

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