Malicious PDF — malware analysis report

Static analysis result for SHA-256 364bde2299a0f24d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 20:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5019128193206f19a505a961d2cc40ca SHA-1: 05490ecd31512fba3fe560ec023a1977537f5bc5 SHA-256: 364bde2299a0f24de4523ea5605d91538af62a1759aed66500ab9ec701121374
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for distributing malicious content or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://jin-ji.com/upload/files/65173611212.pdf In PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tovirizapetugabizugexaji.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357e01ac1f6---xobijanufojozelojoranufar.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/96781883004.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/xivezubebi.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e1dcdd7---valututezivelubodewosowan.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/49751341265.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wixupewazon.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/xukozusajuwurim.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zimikikowawomisadif.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/74225637475.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/lenamodamisipunebijo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/bufufovixumeponetamefofap.pdfIn PDF document text
    • http://bronia.org/userfiles/file/56955309636.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vozosiredemokugupasuxode.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/32874542579.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/fizakasalukajepijoxunesag.pdfIn PDF document text
    • https://morabia.fi/images/file/8941892816.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/84634065841.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210912021158.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tefedekafipenematowofoda.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/81854383306.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138332bbe1a1---91184232762.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gopaniwegujikodotolabebop.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/tilinusakit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+pubg+like+games+for+androidPDF 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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 11228 bytes
SHA-256: 36a9274a7938a1658a8478bed615794952318f414ec038578a899adc3b22ddaa
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16632 bytes
SHA-256: f11561ee77d5ab407830072394cba426cd4b43fac8988de3e886de69ae9987db

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