Malicious PDF — malware analysis report

Static analysis result for SHA-256 710087563bb34345…

MALICIOUS

PDF

84.1 KB Created: 2021-07-20 00:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5e34f259e154a166811ad66c1f92f0cc SHA-1: 7fdd864ac648b953de563b7148b1400192f51948 SHA-256: 710087563bb3434511cf76f7d6dde7c65bee784eb76a5d6e6c0c9522294d630c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads and disposable hosting, suggesting it directs users to malicious sites. The PDF structure itself does not contain readable content, but the presence of numerous external URIs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://adhdesign.de/userContent/files/20210630084826-gewewogoparitigowuropeval.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa6eab27a---17827550785.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608029bd23d0f---piberixojajuvasom.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vajifififi.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/55128001066.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qedk6qv01n0eqt8jrdq2in7qg0/lamuvuzibuzoduwamuloxexu.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/37226290957.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/54636e9d285db2561dca04ce472149a1/vufabavusefilolajebelesa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609459a9cc587---polag.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/9sca9c72j05ia91c61vbjb102j/dajemaz.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/93756494164.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u0g27137vejg9kkj81graeab91/kadavipija.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f5736797---58596936565.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/romexu.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/retedezigipenigemeparod.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/69880a113820decba305f9e1d5abfd71/xajibuz.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/tanoxolasulisi.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/89900893746.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210714020837.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5000f9fa57---bufinovopuzuwukusu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4657e2b805159a54d83e358753e7c7c5/54634267864.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/bunutim.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cb4397dd---30171045157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tiredness+during+first+trimesterPDF 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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16812 bytes
SHA-256: f3d3e1983fad758e4705c7f2515522f85b1790c7d5ada73d24d6ba7dbfc8c14f
font_01_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 10432 bytes
SHA-256: ca4a9cb3205dfb524f02c7e2c3b9e87d41a62e1b5940fae5b40395ece42d7254
font_02_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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