Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cb4573af15f263…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 01:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66a8b172301b545073cff7a22360ff55 SHA-1: 0206408f3a84742e99110216a90e0224b41a2272 SHA-256: 79cb4573af15f26378352bfef0368521e6554f27e379eb70e1113c011f1f96e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

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 http://driver-jazda.pl/upload/file/xudiramawaroririlud.pdf In PDF document text
    • http://houselandia.ru/files/84375642633.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/64f0830156fa8108b6f94e14b2dbb928/zuxevunigegepi.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/wogurivinopo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df351d8aa5d---fefiwimoturunusagoliguru.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/047b3cbd54b9e8b8c17f6eb40ac394c8/nafolofokinavofizulogibu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a773700440---40852057909.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/76494352046.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fokepewozejo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nimusewadizepezalif.pdfIn PDF document text
    • http://texmet.pl/userimages/file/87803384932.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747db651a02---19797816155.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/dujinexabavajefizanujek.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krk9n70gev89gtikb9so8hcq7b/98316480222.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/lawimi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a15859b6c---tibanitojavelogagomov.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6781500b---45209658157.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/15799821002.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d52202d70---13113156096.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b902671c2---dafogititapepiravib.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb55f3e67f---72873314038.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/bifusadapewa.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/joxusibovijinijusirulo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/12020761467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gastritis+causas+sintomas+y+tratamiento+pdfPDF 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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 10988 bytes
SHA-256: 61002f80c569814bee4d8e0d3399e88f699010b5367523ac505159e40225023d
font_02_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 18768 bytes
SHA-256: ee08bb73c0811fabc2ac2805418fb7bde5c1554d477352cd8f3c5b54ad5eb640

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