Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5a632bdda56630…

MALICIOUS

PDF

100.4 KB Created: 2021-09-05 04:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99242f53b720ebf5d22a948c2b2e764d SHA-1: 4360a3b5cb55e088b05d2e8e397c1a3a91054e9b SHA-256: 8b5a632bdda56630282942032690765fdafb8522019e1b4447805a9f58e04461
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa4fc6308e---malaranelirutovizovaxo.pdf In PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f56f10e07ce73cac25ecf2f1e20083e0/65521437465.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/xozarodenuzowevokixinubur.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/je8gpf57i0tgbkmji3p96ihl76/zapuvutozofuv.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611984b6666a9---muxanasos.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/9869342474.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/17011950026.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/dazadivatiwazot.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/lenigazifosasomilew.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee9eba3f4c4fbf955ccaad862f773c28/jivuzokafolagosuzesoniz.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea62d981d6---kirelifaga.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/35970498306.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc57853b6---79357379313.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dorojuvasakubiferivozaga.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xozesopewogexiwolofez.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/19c3222cf304c01a102c5839bdc1efb7/63502807193.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cc57e3431---dedafaxezubujexuxevum.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/zurozoxifajafigonurilogi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/08fbd7e15cae5877aa7485254ff367bf/77947159985.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609484d2d18da---bedasenavisud.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/bopilof.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pmoco9svfgr789oofk4tnb11c4/73724639283.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/bikuxunutelimogabe.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e1668d0ba9e6dde7f1e2bb0577f8aa10/11852521378.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/faporowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chemical+reaction+engineering+2nd+edition+solution+manualPDF 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_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 19568 bytes
SHA-256: 90d1864f81892362ea1d41a70b196240d13ed659819ef14744bf94182c0641da
font_03_sfnt_off00016913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16913 11068 bytes
SHA-256: 667de29e32553ab589b78acc330864e4b3b12aa49a55a71afacaef1c0aa1dc06