Malicious PDF — malware analysis report

Static analysis result for SHA-256 740a4eed8460ecfb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 09:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99805d9ad695589e01b573523f93a67c SHA-1: 8c420b22984d29c6274b811920515615b1fe5c0c SHA-256: 740a4eed8460ecfb8b4df0661a1b33d8ca9f0f6d10c9df4e39127bc937282770
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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://philabc.ru/uplcv?utm_term=how+to+open+wav+files+on+android PDF link annotation
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/82316787788.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161416370c6485---18491317354.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/25826597004.pdfIn PDF document text
    • http://prograsifkalip.com/files/wolidadoxaxitune.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10485346610.pdfIn PDF document text
    • http://samtle.net/ckupload/files/muvivelipepixuxawazadedon.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zaxipirabefidol.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cb48b6b59f05a58fb16755b037cfb2a6/salonizimonulon.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/sebelivazet.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jojaw.pdfIn PDF document text
    • https://clove7.com/userfiles/file/fifirelelurenilajegasute.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/xozetes.pdfIn PDF document text
    • https://serka.com/serka/upload/files/gogozajuguvivugelejidugef.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/73095574462.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xeratepikozibazerik.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1125191164.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/46119474679.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mepigir.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/75635353004.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/gugakawepebupulezawujoniw.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210905_34D2F0D1E2A990E9.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nupixipivoka.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/nufodiben.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/dalilujosawem.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411d24416d1---xekononik.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/lexovobopipesirawazipe.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jogibipajukopewizijojixix.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10632 bytes
SHA-256: 6275d5141d38c578553ab0297b325f690bd3a338ec29454df53b96049aa9390c
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 18712 bytes
SHA-256: cf98ce4e293b0a14c63c73a4c41e9231bffdefcfda48f0f26a37f4a8508c3729

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