Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a09cf20ce4e6b4b…

MALICIOUS

PDF

84.4 KB Created: 2021-10-09 13:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00accb17c386e4174f54467ab54dd24f SHA-1: fe71ba36b64e4d9d39200b29a4ff5c46a981e5c6 SHA-256: 6a09cf20ce4e6b4bf25461cefd738bdde45ff71d1d8907c77b4d155943f5e62b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a collection of links to various websites, some of which appear to be compromised. The primary goal is to trick the user into downloading a password-protected archive, a common tactic to bypass security scanners. The presence of multiple external URIs and a link farm on disposable hosting further supports this malicious intent. No scripts were extracted, but the document's structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=how+to+zip+pdf+files+on+mac PDF link annotation
    • http://laros.cz/UserFiles/file/96888104487.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/97180346690.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/54915679614.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/4134217425.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/wapotenexerer.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140478b676bd---mewulujepasogu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9802a49a50f97a1e5627d15ee3c0de4d/67410512246.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/66456352675.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded9d95c4---24778940069.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/26479370789.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/50866766610.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/mutosobosurul.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/dekexofalil.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/wopedilixezizubifas.pdfIn PDF document text
    • http://spakimthi.com/upload/files/nugibiwodudomadu.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/galojepa.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/65206420345.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/rakoxexawav.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/sapiliv.pdfIn PDF document text
    • http://qdcmd.com/data/files/gufidunizopud.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/dujudizelifenak.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1615dfcd63f243---xixiporajikak.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/16657578483.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nepikapinizuboletigixa.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/lalumizubopago.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/21550360145.pdfIn PDF document text
    • http://cjmfgxfollow.morIn macro / runtime command snippet
    • 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 18864 bytes
SHA-256: 407f82732446ba3fa7aba2e1313c3f6e110c5b185f8020eaa0a36b76ac48e724
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 10820 bytes
SHA-256: 79ad0ecc6fe392ca5b6ddeb5506933d5602ee7aa6e706fbae0ca3cae44c9195b

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