Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59fb41013929787…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 08:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e5b7f155557f2cf7bff3ca3bc7db3ad SHA-1: b3492fae307f0ab92dc3f4b8499d0d7eabd5c53f SHA-256: f59fb41013929787d21227111c65b0c2d16a16392cb4ff03555e361cfc134d5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of PDF-specific heuristics and the overall structure suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://harposwebdesign.nl/app/webroot/files/userfiles/files/lajisepisavagefel.pdf In PDF document text
    • https://abofahed.com/userfiles/file/rozekabawefiwulad.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jeguwafavalosexenedub.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/bimegapexasasuvijapadoz.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/74186876548.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/936799254.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7c4b5bdbcd789a7b4c2d6670e7fd290e/96642672117.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609038e0ce5d3---14679456297.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607606755738a---nixegotudatakoso.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/doxogitewu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b1731378483dfc5ede8953c382358122/bunofulivatiz.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/37792847397.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/bezododes.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/jevilozatepesamenakejut.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kirolopuridup.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/96713523572.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/17d2d9eaf33b634864d6819caa676d02/pamugog.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/fisivijinogapamowesu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/aa5e52fcbd30848daa2a384bf58139b7/13088694162.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/62654480267.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1bcb76357---78332074689.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/21420517428.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/napozet.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/10557779180.pdfIn PDF document text
    • http://firegallery.ru/img/upload/7614930277.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/vipowagoli.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/1667035882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=smm7+uk+pdfPDF 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_off0000cee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 9956 bytes
SHA-256: 79495b97632104c9a7b0327ae6ff5e2fa27e4e640cab86dec3a0a1a25d081275
font_02_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 16212 bytes
SHA-256: 00bdcf82f19e886576225746b987a3a9c611c4f4207260504272a574cab233e7

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