Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338563fee080624…

MALICIOUS

PDF

91.5 KB Created: 2021-08-14 05:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f087ff7ecf107c461a6cfa24b73c01b2 SHA-1: df6bafdffc9b2def021e8081957752691fc64c17 SHA-256: d338563fee08062466c72968241b2ee0176a4e13e0155cf505d624ebb317aca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs likely serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=caddo+parish+judicial+records PDF link annotation
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/88cg0no5diudiovpef8n9suoug/dofafadabosamofa.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/52223164644.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/74f7fcf32bf3b29972cdadc365f4555d/67007330363.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/29560406801.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcaa00f806---38183305846.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/rizewopagetodapijemujane.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/85773814205.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/r3irlhjadjim6k3s4fnigusnd4/89846849292.pdfIn PDF document text
    • http://meskerjager.nl/media/files/josumo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fitijefuvoruwotelad.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/rekewulalexiruloriwukol.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xedodun.pdfIn PDF document text
    • https://alutat.com/data/file/dupoxelerofavig.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/02949954c9024d9a371864df2dfb66be/xovamanakidaluxezo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/480f394fc2e98f1075fb2da9cf48b66b/paluwawow.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/41230372815.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/567d1ed159edd06e305997ce9192d9d9/fixifivixejemigipa.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/mogosex.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dowijukazexadivogojig.pdfIn PDF document text
    • https://irantruck.ir/data/file/zuvopageto.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/wodutipafizizujafereda.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/2459973111.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/34822172093.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/roxetogarezidajafi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/63112120757.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a591527335---54248921683.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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 16548 bytes
SHA-256: 5217a724c66da3d0736a1ec46448f4c310b06733bd378fdb1f462c04d76a25c7
font_01_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14712 10672 bytes
SHA-256: e370773d5bede7203bbcffee13cc8936faf85b5709ad39d722a85937b073d6a7