Malicious PDF — malware analysis report

Static analysis result for SHA-256 675a89207c0fdfa2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 10:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 385f13bed43aa1b094f044c4930075a2 SHA-1: a76f1b9758fbe84a0219c9ea47b6dde80a7f5bfc SHA-256: 675a89207c0fdfa20b87d23a3cbbf390b6f75b8f1e78b4079d4ee4bfb88a4bec
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798b7c2d961---fipirevogewemozow.pdf In PDF document text
    • http://chaitraglaze.com/uploads/foturofapovemobazelun.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b722caa65c4343cc2e474512c7eb1cca/50630298551.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/68442933118.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/nasosutejaxezok.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m6k5pbeahcan339i3mu8ft25vb/vamakijimokepafezid.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c87de0e4c---mipitotexitudodikemet.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/towudezada.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108022012197513.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63923472460.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612179a82dfab---26222510269.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/683682047.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a07a8973785f1ca8fcc8fb285f04eb5/6815284371.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/4182012428.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb41c0dda---99153006050.pdfIn PDF document text
    • https://go2germany.ru/files/file/1784730491.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/negotomiketeretud.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/rikonozovibijixesuvaran.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8r86727h0l0cdqvt9rg3u3l2u4/kafuveko.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/3b14d5e0363a2a2017f56141c1548bde/taxopig.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14cf2743d---fatod.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/pojanarivinugasedanef.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/suxerevanoxufevibigapufe.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/madolekunobesixugosewes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gk+quiz+questions+and+answers+for+class+5PDF 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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 11124 bytes
SHA-256: b02c1bdc008188ebbbc41528c758e0e8f7f68871c4ede4dc092c0642fa193d0f
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 17872 bytes
SHA-256: 9ffd9ec2251647915fb9ecbf4674860fb831d6c4d6a1686d52aa8b25acab4425
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1