Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f636e822ddfc14e…

MALICIOUS

PDF

104.5 KB Created: 2021-07-15 12:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 93610e743c7aaf0097ce8e56bf730d25 SHA-1: a6a4360eb73b6fe94ac301da07f65924613a7f08 SHA-256: 5f636e822ddfc14e113ceed14d05f616dc49e7f6250659492ab00f39eba64f3d
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to lure users to potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • 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://mya1fc.com/files/ckuploads/files/42565257037.pdf In PDF document text
    • http://helder-effect.nl/userfiles/file/bewigakinigenupawopat.pdfIn PDF document text
    • https://manenshop.com/upload/files/32526988816.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad621135e---42964729480.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202173921589578.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803ca1131d5---8588882188.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q7l1htbhgp1dfv06bn653sts8k/vifamunatagar.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4817c31f6003724fa919d608624c0b96/5446463469.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/bobekomafelawep.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607890583bd23---vegepenilewisev.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/87885291054.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd918b35e2---wolofupefoj.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9e4e28fa587ded8b2b82d22af8f2fab2/livetewereworilifupevi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2cef9d0b44654364263fa07df3b5229c/49752980004.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/midoma.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/ratawegitoneve.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d3362540---24175219449.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/torudawotiguwubip.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4916c9278---1318844343.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/21373802421.pdfIn PDF document text
    • https://service-panev.com/userfiles/dezowizezupavedoko.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f58db83ee5c0b9e7e34201c85c5df486/vevakejijibuvapi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9qoi0ti88m92idp728h7solmd9/sejatupudaxefuduj.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079562fb5f9bf2ee32a1868e2a00f532/dumesanogu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/86204698501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vicky+and+ricciPDF 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_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 18384 bytes
SHA-256: 69b66535560990895b96e7e7817e9e33198045b83084eb832a4bd8f538ed4d95
font_01_sfnt_off0001669b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669B 9972 bytes
SHA-256: c28f360b004e2a5d14aec4aa33edf5ea953ee3911743894205b5d3a0a0083be5
font_02_sfnt_off00017ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1