Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7f7c8517fd05ef…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 20:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b78ff8b7106bbac6b2a97f708aa5ca7e SHA-1: c5478dfcc8c586a1adc9c69626e21860f253eb69 SHA-256: 5b7f7c8517fd05efa5de638a8eec2d1d4d9ceaed046ac06604ee8c041db1b990
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and disposable hosting, likely to facilitate phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to disguise malicious links within seemingly legitimate or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/56763581405.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tusunazitimobadonumexexi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40cfe5d72---73911408483.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b967748e00e---13436889382.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/2a78cd073f6fb94cd7c57f5f5ddfc7a0/kejifuvawajuk.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5c302b335cc10305410c6852200d1921/jolatonaxufazunaniju.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fokudegadowiwesexe.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/uvqvsajsvqsimrc7hgkrpcick0/66475611678.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/60857618476.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fef01b7ddb459dfc41a6d47649488d8d/gumemomutenop.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/vebofadawe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6e8492212f21b3eeedbef790910efa75/23777955219.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/88344531021.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074508ebcd81---77232871038.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/74e364c51aa42997c4600855fdd8a848/73019266244.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5df470aa37e41dda360c595403a2b6df/sogutipudulobopit.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7c3c5feca036eba5f6a3ad4013e9b030/83653094720.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/35a749b6bbd19dcddb0f5c90f2e9f57c/lolupewub.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/mupif.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da200175f---53120092081.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210516020149.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ac2e14027b87a488efc2ac2f5118a4/50067329216.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/leruserigaluluxevid.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/11087480434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cat+goes+fishing+free+download+windowsPDF 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_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10748 bytes
SHA-256: 711097ca6625f5a5585ca7cf174157bf05c7672dffec78e1c32a2d3e34fbe251
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16616 bytes
SHA-256: 986ae54b60bf28f7618c13e5b8e91fca1a136d4e4246c9a70e6730be9c464990
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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