Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d553bb67fe41c9f…

MALICIOUS

PDF

89.2 KB Created: 2021-07-06 17:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd13265f5858622435e5d3a09362e4e SHA-1: 47a7bac946ffd684f07ff326fbbf7920af58f4df SHA-256: 3d553bb67fe41c9fa740ba35b66d4ca7d6d1a1dfdd90edc505e4ba7db8d1898f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pensiunea-escape.ro/ckfinder/userfiles/files/levoxuxemunudufik.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6828819d3a880811949af9594d829d0d/71915505390.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160711ad960722---56135597894.pdf
    • https://mumegram.com/userfiles/file/26633616410.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690285072---savobikawubozuv.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/28675213720.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1c3b42c44e42362997f6f79ca90f7534/90828083671.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c0e3773e8722acb907a6b10e50d8651a/tagifemiredarugisoxera.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a87a080e28bf0f76d079c159d02c273f/xasinotesidanor.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5c74b982---56823890306.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a597080519e---xowadikojomerorig.pdf
    • http://abc-tel.ru/data/File/tugulagojitixuti.pdf
    • http://king-ber.com/UploadFiles/file/20210704085451851.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/80103993180.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1f0399c809180c3e14d9ceea39e09df7/pikojelijugego.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed0853ea61a2278f2b7146901426edd6/kobewogitupama.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/wonazusutagoburakunen.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8cadb8c5---bulojizufofe.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f9e226ee405ae980becf81ab52a0098e/4779187090.pdf
    • http://afgventuregroup.com/cfiles/file/dugujuk.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160847b24a36fa---41217788189.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e9435ee63f73d409bf4ae046bbdf6d4/sadij.pdf
    • https://alshamiltrading.com/alshamilfiles/file/zuvevepu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+perspectives+grade+6+unit+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 16792 bytes
font_01_sfnt_off0000f76c.bin
19fb3e0837d6f9ee728c5331d7bb33e1bff3d595bd4ca4a0aae7833d7d421d60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16120 bytes
font_02_sfnt_off00010cc7.bin
50728100964f867cc812f44329f6c5396531bedaad0bd9bf020ac73674783912
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 11016 bytes
font_03_sfnt_off00012673.bin
4c48444cbddbf63c272f021a34366cf0cfadc0a65cd9e72f10413acd1240a6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 17816 bytes