Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79061f22e7534b4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 01:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07b0f102a7e8b26f24bbe793b95e715a SHA-1: 6346ef77b195485743ddb5d302bfec6be0694f6e SHA-256: a79061f22e7534b44cbd1ae8464c6f4b542eca7120943c66b42a46fc5287945b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised upload directories suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cf603350---paretijutibivoxigi.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e22b1e8b---26192423583.pdfIn PDF document text
    • https://kede.org/userfiles/file/tivezodosulavadepafumurut.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/33942418743.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/sezapakonis.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c10e2ce68---30999355094.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/mulepafoxiduzonenukupoja.pdfIn PDF document text
    • http://1carl.com/userfiles/file/jakovoxa.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/22781454187.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c493a261---kepuvafinesaxib.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/92706606510.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/patelibelovobevujesod.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/87871316641.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/48231072619.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/orncd35scngt3hht9pb7phnpsu/23314552900.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/lajojutimirorab.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/41107327951.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/duwaku.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/86927682012.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/77862044591.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135076822c06---vupewelarelopofugu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/41067547927.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/tugaxut.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/31725952548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stickman+badminton+unblockedPDF 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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 19316 bytes
SHA-256: 8eca5ab78def66e896e4e77614253261181c7edd1ccfa6adf3491c888eb2520b
font_01_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 10672 bytes
SHA-256: 08587129d1e6e6a5d99a41caf0635c22e500cec126fd1a753527d69ab9f82d17
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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