Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef7c58128832aa…

MALICIOUS

PDF

90.5 KB Created: 2021-07-21 03:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6aa8b225fd227530079100ba440c03c SHA-1: bda852f55355257c6a523d0c71135462b63db27d SHA-256: 34ef7c58128832aa6cbd5a391f6746ee578879c64e1a5e25a38f716c23b4551c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host more malicious PDFs. This suggests a phishing campaign designed to distribute malware through a chain of redirects. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50e6be8cd9---rowes.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cedb9d449b5ba261f98913871103720/rijuvaxakikaranumile.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/qum9aahftpj44rbc2ooq8r927c/pagujobege.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c352e86c00f---tixenasulux.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cade413a770---44334932225.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/02/file/lakavipusakunul.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/30744811103.pdfIn PDF document text
    • https://italvaping.com/file/25963911166.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe73e713d---jomavifuzujekikoguz.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/41276129177.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e3a55347---lifojimavurilafik.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ef76abf2ce2592f9f75b8c5f0da0541e/sifitijofivifobujaxunadun.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/46109518549.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a21340b4eda---40596819834.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae0bddd24---57036658627.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/39433020856.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3fe0da99eb6acb8c7cdd46531a8ea29d/luwivo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba09469b5---9837976756.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7e1a858af89bda6e21e557bc829ceca0/kizavepame.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621605899.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609038e0ce5d3---14679456297.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sccarpeti8aerlftaajnqbb9jl/golugu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/57c563b7f85b200b62552a9fa02ead0e/dimofokogideg.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/95711954443.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c896a571f39---tonemunapowejonoledipa.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/81016197708.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/xolanamufexunomelanelazun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=antiderivative+of+exponentialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 17828 bytes
SHA-256: 7ea6d30b311e1f339ce7a47ee4560f2ce374bfc69b763cd861dd7b6d54ac6a58
font_01_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F09 10472 bytes
SHA-256: 4c5ab67d897d3b9777d5246bcbbe721e1e1d1cc5b0b6683fc02b17e3bee3b7fc
font_03_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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