Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bb7c9019492154…

MALICIOUS

PDF

106.6 KB Created: 2021-06-29 21:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b19951ae7b5df47bfa85d25ba230dbd2 SHA-1: 092ccbc1bc6bfbdca7c0aead1795012678883f1f SHA-256: 56bb7c901949215469fce55e84c595163ced6b3d89e30bd9b4b201aa6fbedece
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a9e9219d2bad86b6199768efd7a2f735/juvaleditijodikalur.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vk5ocqv5jk7592jrb323behvlh/44383403302.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c274d17db---18295410129.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9813bc0---polinikipane.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/714f0565fd4d4967d4b6ef831a1482fc/gakomafifalinekewixovis.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/40544155396.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157945bcd2---suwiririgunurivow.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/60889057591.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7c318d4f3---46349033553.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/enf7sgk5c9o4863tjtlv013t7p/lozipu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3r00a4b5acup1lmo1deeig9na6/kemojiwixen.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0fad6e46cc28599d1073a3bb54d8251b/70095948651.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/12520030976.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/94578931394.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/bad8ff4913d6ab860e4e8559841e4a40/fivopebejem.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vl464atii7f705nhv350ggkrm1/paxusu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72c875c51---54386564564.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b954f4d---xudedesoribimazobafizakin.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2efvvme93imdmuc62s4a054g8f/fanetesuboda.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9572d8fe7---gijugubavusud.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a830ab4c5d1---zoxujasuvekekupixulek.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/belozukuzofaxefube.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/rorebofakeruxilas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ruby+string+replace+substringPDF 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_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 10828 bytes
SHA-256: 3c60781d8ab04556475c1ba2589e39a04ebb562377017e6de166c0aad1e13888
font_01_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 24408 bytes
SHA-256: e7f85a4556c747a2c4f05f28ef9d661ce6ade4ae1b93b96dd5b2dac4650eb118
font_02_sfnt_off00018363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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