Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cbd506a1916323…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 05:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 954a16b802a73c7f62998e4a2bc697c6 SHA-1: 5b05662798903823bf2a7a01efa6901ab61ea736 SHA-256: b9cbd506a1916323ccd57495bc3954cb6cfb7f444e3c7e946c04f199e4bbbe6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=friends+reunion+watch+online+full+episode PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e162765f77da2e4ff3231e6049046b98/53819210616.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/18466856008.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/77283127469.pdfIn PDF document text
    • http://artio.pl/files/files/pukajoxa.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/48843629454.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/81422545524.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/33109741622.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fafe718696---75729037922.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/17767567446.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xalakokimuruzowusun.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pikunexodelip.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/47661196911.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/kepevawe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jemujimebolob.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/89591911339.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/11450867705.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/32737713408.pdfIn PDF document text
    • https://irrisyst.eu/files/file/97224627304.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/solabejuzawokosamifav.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/76232812388.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/tavokasudupot.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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 10880 bytes
SHA-256: 98da69177e0da116e7ceaf7dd4d9644639652a3c61be419b49332b48092221d2
font_01_sfnt_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 15032 bytes
SHA-256: d15a8463a68db382ee98b737a57dc0403b12b35f8467c914c9720000f816bb47
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1