Malicious PDF — malware analysis report

Static analysis result for SHA-256 6443efd607b5a682…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 06:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aef3d878d410b89b71f28a489f2d7c1 SHA-1: 29c836b75b8cff62d7ebbfffe118314a6c4309b9 SHA-256: 6443efd607b5a682212d2087e080e8cfc8e2bacbd695a14708eae862f265718b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/xamimudodavuwu.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0e3dbcbc---72611436528.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/menalina.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/32545618627.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/65936270987.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161302638e8c72---62490642479.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vivodumogakezina.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/59044996389.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/94631157817.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/74292142641.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/96150512015.pdfIn macro / runtime command snippet
    • http://csc-vietnam.vn/uploads/userfiles/file/21094758831.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/69733937638.pdfIn PDF document text
    • http://safarang.com/basefile/files/karokuxuvawodivapobakuki.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/82923991103.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/revabirizazenexiz.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/rawegerukoxe.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/23840773885.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/bopiwudewirilolelosa.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/nigenepurumuwozudagudewe.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/35813951145.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210903232410.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/86c24f26b6b3c983abfe51d2f30181bb/liwetawo.pdfIn PDF document text
    • https://takipbizde.com/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=paper+2+ioPDF 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_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 9952 bytes
SHA-256: 2d2d8763ce18315ed6a699149b34ff2aadce93d702c479b433c9e192194c1480
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 17272 bytes
SHA-256: f2d1b6a74b5d66d20347b4d22af1522275d25e904dc6bc1a5b44764338cc7d3d

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