Malicious PDF — malware analysis report

Static analysis result for SHA-256 73badf1a16120f8d…

MALICIOUS

PDF

104.8 KB Created: 2021-07-24 05:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e95b452912ff4500c54f83b9b6265078 SHA-1: 0b46858a19f53e66815b9de8ffa0041467f5d55f SHA-256: 73badf1a16120f8d99f2bdd0f90c618edb5b1a44974a665a8e30bedd14be4f4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://alexandrapanayotou.com/web/images/static/file/29123703191.pdf In PDF document text
    • http://meta-min.com/files/17624206696.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74e6586a3---wetilezafejewototemun.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/71385906471.pdfIn PDF document text
    • http://brlairport.com/images/file/15553813820.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/22520052956.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/52098398515.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/4pbnk1afbhuu0d6n7a443hljbo/ruxenexefevidekamab.pdfIn PDF document text
    • https://anfauglir.com/images/file/tefadiburijexexumonis.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tisolixeparipo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nopoka.pdfIn PDF document text
    • https://digireg.si/upload/kikubavipemakodubodi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/77170576481.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210701_120B706E23D4A4AF.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba02ad3110e---17683044992.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f9gnk176ljldppv3of3vdcrl32/muzipowinimivonodapupisul.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210701214624.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c4206b685c5dfa5e2c1ee73de5d3c19c/5570709674.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021630912557277.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/61491245579.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/61bac9332b2752011a4d43dec37803d1/93817104285.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be167c5c4a8---90287785983.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/e4r07m5ak2kmq97g868ffba535/kunanuleserajuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=telecharger+yacine+tv+apk+windowsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b27b55992a978872decf7a7744418ed4/dozekabizevoxilefadolufi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00017240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17240 20236 bytes
SHA-256: b639506a5c91c3fb87cc6f3ef09ef05e1fcc6780c7a4ee41b72cd5c7c9154e0f
font_00_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 20256 bytes
SHA-256: 40557be548b7d0acccdc6cc8a0dce8ad5643b554bad9c7a4e24625dbe21aae2f
font_01_sfnt_off00014069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15880 11112 bytes
SHA-256: f01857f76ddd69e8f3326eae9edc0c2734534afe5f60db1008a55ba20ef9ef73

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