Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4e6e03151f671e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-31 01:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7b793d7a39f34c07f694a1a7af5f6cd SHA-1: 1efe4e93ab4fafa717383fc63606fd2caf77ef68 SHA-256: 0a4e6e03151f671e37c68da3bf721e7de5b4f3174a1dba0d71909164541b38d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised WordPress upload directories and other disposable hosting sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=significant+digits+and+measurement+answers PDF link annotation
    • https://mayxaydungthienlong.com/uploads/files/files/mepibilavusevererox.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/netojoguvutoserelixujo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fafokuliwatopo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b72aa22f---82341254488.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/588cd5111da487c181ece8739c1767cf/kakorivopirubinogova.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0520fc51d938ae417b37188d1a21ca8d/50830946652.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/lomirusumirar.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082147a866dc---rebanikerirexan.pdfIn PDF document text
    • http://vipdiler.ru/files/file/timivesevozilunefirep.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/dilotonolapamovimoni.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/gifovazezemutiritefavo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/togubabejoluvubemojazo.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/bokoriwenozuke.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/keravizunajosifofipomi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kajofitir.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/55906261307.pdfIn PDF document text
    • http://195exim.com/datas/files/fatigikemolirinoroxip.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mr76fik0gjohgfp0adlgi8a6j6/8401342114.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/58148526034.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///raxewikerodavu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5da31a2b---80919387329.pdfIn PDF document text
    • https://signika.pl/Upload/file/87960901315.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/35860598184.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5vmlm7dngmjd4csuv4v0pk1470/13802242544.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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 18380 bytes
SHA-256: d7848a1ee3f5bb19c3fabc6d30ab1c95b01fa0d4a97764bbed2deb698fe7d5e7
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10912 bytes
SHA-256: 8e0ff9b76ab51bea75a3833a4d4c9ba00496558c62669a089ebaccbd4ee8fee0

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