Malicious PDF — malware analysis report

Static analysis result for SHA-256 506fbb937b7c595c…

MALICIOUS

PDF

91.1 KB Created: 2021-07-14 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50680ac56b4160f63273286d467e47a0 SHA-1: 17b7d9efba36f6dbed1b122436d4ee6fa224d489 SHA-256: 506fbb937b7c595c1be2924049536a014164ea546d3f05997fa29e700c3a65d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=15000+rubles+to+euro PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8bfb4815ea1e9564feb0b06bb5777963/pizum.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acfef6a216f---4499348384.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0e28bf69---nonabazewate.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac7b4edba---51459287662.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/87481293396.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621666350.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/dufiwasoz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c6cb4d77f65f66e6f04a092d050a881e/wilugefuzarosufotuwizo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dip4kjqiopmbsg6i3100ibofrc/waxireporeterowet.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tf0eu1a87jhdm9j3o9lqsotk55/63822733013.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33226025914.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058775f8b0---rewasegorazoviwavelov.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e7d54957---filirofomotupuv.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38894e7fe7---74665851067.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a138cbc650c758ecb4f980c6ae42cab7/ponusufodob.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ec124c2ae9aacae6a2f3e693dd154d2d/janeximilozusa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8btqdre7qae3u9o8htu79di5lb/mewuge.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/aec087d35d9f892ea01b3ce1ed271ec4/tiwag.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/84968589976.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/7173535136.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/i7abh1vild3k6kn3qmabtf91dr/nogokowemopibit.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 10192 bytes
SHA-256: ae83ff76ce6618708167fda968f92398c668672ec52be349d1bd174eaeec88f4
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 17804 bytes
SHA-256: e1a91761890919bb0318079edc365da6aabe8c69b7ed23eda2306c4b52cc8cfc

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