Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dee5494ed17c1a0…

MALICIOUS

PDF

83.3 KB Created: 2021-08-24 00:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43350fea0f30fa1c1a2ccd70cd8335c2 SHA-1: cc832f84e88131f11198cdfb82fa45fc81992760 SHA-256: 8dee5494ed17c1a04e352aff8a6578deea4d38a5b550d40f3990c088e305c4a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a collection of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=the+english+reformation PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad010a2113d---65342428638.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/genokawatufolutikapos.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/9314915692.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5c37c4747---73574492078.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6lgg6ru64dnid3dn8pmrpuicer/wulimimimitasiliwewevev.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/ribetevok.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/8069296791.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/5810156433.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd4c44b2aa---94228050034.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/k67l0u128m56he035lk9ncdnc5/wabinatipusobibubedituv.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/xowoxazodeminexedu.pdfIn PDF document text
    • http://momsystem.ru/public/file/vojafumumaxegokudarav.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lpad1lijit8lrq6f6g2911soq0/19301557093.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/tejipaboxuwedigov.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/12b5bac947bae0d690a18f239b71c040/delomebepe.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/mizakapebokowiwibup.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jemaruwepigagujazisagoda.pdfIn PDF document text
    • http://vejwun.cz/images/xulenisew.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/37971714847.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/roguzegabokowudazifexojot.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/10d6269cc62ae99efc06ed14569576cc/80527083644.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d141226283---wisufixakowabub.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3fb4ecec6f2cc6dc8db3f7b7414e6347/27790710514.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/peligisasoba.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10624 bytes
SHA-256: 28841a10f2a5d7c9d28797967542335657e108c45083cae525716729dd44cef7
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 16964 bytes
SHA-256: f7b4a9c011b776f180223d9012453df0724f8de0497a17cf2dcc8f823355905b