Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3436d7fc64e53d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 22:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c02a55da5044daabf184d4341bffbf2c SHA-1: 27db85671c13d53b94fc7f4f197cd9c257efc9ea SHA-256: 9f3436d7fc64e53df83c90f2c6ce21a2bfe2a0dbe01f7922efb9038384874ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is weaponized to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=wild+west+roblox+music+sheets PDF link annotation
    • http://copy-office.it/userfiles/file/tojubuxowidadodavi.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/jinubulelas.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b5d6023c---saturumezuzajolexol.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/20166663845.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916033410851075.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/45866741125.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/46929618975.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/87461286977.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/galajapigujowuku.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/redekib.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/jamixizapatopejevefasi.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/77928975869.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/powinegifupekubofawas.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f4582c07016c1426cc560be6adf130fb/dukudizukulubopafiviluxu.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/filoromem.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/499599737.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35103d11cf2a2338dafd06d7492dd188/munupovikutekasilarixafex.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/xokutumopisurosuvawefuzip.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/salajogowonuzudaw.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/79078611514.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/62229957521.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/60708817300.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210912002440_639260.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/63051204447.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/gifabojotup.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161330bceda96e---riloziwubiwodolojawudijot.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/bijixikifo.pdfIn PDF document text
    • 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_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 17964 bytes
SHA-256: 3c137053d9e809cd2c9607e0c4c10f4b69319dc6d2d9f7ad44c1c10f8164b880
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10792 bytes
SHA-256: be41481810c3fae137e8700d562165efee402a0a9c117ee0427e566dd28d7ac2

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