Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c4b522357071f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 19:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09b622d9fe727b0d1a914347a6fd8d8e SHA-1: cf227f51fd4ef26d8b39c6d59407d64a2a50fdea SHA-256: 340c4b522357071f5ac3bd5d81f3f64d32d5ed04ed52caad2f490fbff5429d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many external URIs pointing to compromised WordPress uploads and disposable domains. The primary purpose appears to be directing users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=example+of+imminent+danger PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/34be9210bfc9e968475260333e5173dc/mijemagasofi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed36c963b6---58623493484.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/sopebasemujuwivisur.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/pexolede.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/mavixuxalof.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/362631289.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/tukonodeporekosiridog.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/lemekifulalif.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/remazibosetutitavabenefaj.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/292rfr2jvgrh1dv46hte56adm7/sunizubituvarewuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/823mc7mj8eq7vg4ui9dv77a7c2/87216619271.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d625f5daef3f30f751ef5b79cd34511e/bugevavube.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/33fb8fa1c294a404c76d466e9a7ee123/49994982952.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071864b5f3e0---rirofodalaxomiji.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/pusuvajusaguvabes.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/nke2b06ivg96mue2a7ekaed9sf/50473415755.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2231c55fe---80434623926.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/69441705454.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/tatizedebowupevudupamu.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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 17812 bytes
SHA-256: 0bec3438cdde3b70e2525c97f040ecb2448ece321ecbaeeb4159baaa79a94b79
font_01_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 10756 bytes
SHA-256: 25dc84bd1fba898840a939844a69bf4de0a628a05184499bceb96daa9722d837
font_02_sfnt_off00013c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.