Malicious PDF — malware analysis report

Static analysis result for SHA-256 648f6eef26a2cdbe…

MALICIOUS

PDF

98.5 KB Created: 2021-06-26 18:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a5b34bf564b2ab2e7ff94226c0388a33 SHA-1: df3303d4cfb3bd305e1b099e6232625c260f9667 SHA-256: 648f6eef26a2cdbe8e63167f84aa25161954a90fa901154c2c89a382b196be3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://ulrike-mayer.de/userfiles/files/genitevesupiwoxamajijo.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/3j9ptn4qi2ll9lr07s53gnu9c1/97186679152.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/taxupokunober.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ea36b97fb---sifudotetofalolixoro.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/13336902994.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d9ec002b56bc1a38dac0e216b8950852/87576259536.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9e934f8eeee9e5924f399c657e75ba53/sodovugavobu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d272d739a9---numefa.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9c43c9ec3101643f2264ceb5fa13e6ce/68800837627.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f6f1ac917584f93303a9ce10fe7fb98a/tewesabutuv.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e3b881e8bf5b5686d3d9e49f8192978/gukuvufixusuduzaxo.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/budewixatatiduv.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/15e646a528c6b30faae24b78571f65e6/seguwetimizezudafefi.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/31492855167.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e79458d1fdb9ae6e311ca10af72920ad/40573200187.pdfIn PDF document text
    • https://strechybenesov.cz/content/97027074450.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kirumamo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ap9kgpnsr94kcjctsr11nae154/40557072413.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/b969c2191eb5e28965e44ddde29f01d5/49804083404.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gorafufofezo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/10ec3b69794004f727d767a42c7ef1f2/fudixeroxolumowijilebevun.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/495250c826eec917192eda90557a2e4d/gorowosaziroxogukelub.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/44210317237.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a93fe6dad45---76637623485.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dc5bd742592ab70a522d1952f2f238c7/1385685480.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lolezudisatodexosigased.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=essay+about+global+warming+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca38c8a29---1043943908.pdfIn PDF document text
    • 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_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 11132 bytes
SHA-256: 2596c488027a8112814ecb83fb523d35e590edbe0a04a8ecc8b77726c5b22315
font_01_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16704 bytes
SHA-256: 565dbd5db098cb2e883a1197c71da84974fe0be539adf54cd832e4326a81a670
font_02_sfnt_off00016451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1