Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb72bbb0857258…

MALICIOUS

PDF

89.9 KB Created: 2021-07-04 10:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 659e19708e41bff5b8a1ac2cb396dceb SHA-1: 4c4a7db44ff99b8b123a4194e396e2fa4ba65179 SHA-256: 77bb72bbb08572588284ed78a394fab338b7e9ca135ef0638f064e51df0b5b7c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of these links suggests an attempt to lure users to malicious content, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b79c09d1---91818677601.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/ferapag.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/23410919706.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/fopixipazifanuzixugut.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/zasewifesopu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5a71e8e0c816dc3dddb173f945d6f2df/xozuwipovusit.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2b9ecd5e---64004810373.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kagonubuke.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fcc262b6f949bd5ca538df070649923f/gelovila.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/30868006892.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/xipomimegudate.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rixogebizemekosutenoz.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/susod.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/58105001720.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r4jmpasd1kh7vtcbf59nhog60v/memigatep.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jisujamunuzuwajamolakasa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d12ce34058acbf107b28b7a2b8131408/newilozizubi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/751199558eb865f0f02a34d4c89e447b/vuvatureb.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wulavabesapeninujebos.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/ninimege.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/rufipetikepufubomu.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75693310817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=average+living+expenses+in+indiaPDF 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_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10496 bytes
SHA-256: ea1a1b68f159a093fd3a454f15ec62726832d5d5c845e87e67a93dd9ac9e11dc
font_01_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 17740 bytes
SHA-256: 952390ac662b8d5b7a906af168fc70ed5e51849c77058ebdd3cd81ebcb4dc81d
font_02_sfnt_off000140eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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