Malicious PDF — malware analysis report

Static analysis result for SHA-256 489fc4e035b1a60d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 01:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 27a65370b795bafec593107dac0fdc54 SHA-1: 3345c518f59f1df8b50e4c3e05934de319b17a12 SHA-256: 489fc4e035b1a60d905a25d6698e1fbeb5a4430be60dd7c4e2d70166538f85d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://synerhu.ru/uplcv?utm_term=top+antidepressants+for+depression PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cg72t7i4qeocsr8sj26kv6g9a4/16975724501.pdfIn PDF document text
    • http://enricobarraco.com/files/fiwuloj.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/52888801642.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4da888f80a9e89836559198f418a6cac/dunujawoxosuk.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/musamoderetufi.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/gifozeb.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/64227357056.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6a36308a9f05fab0077f832515540774/difazifu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/2822123716.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/78379392775.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a731633e6643ec27893b92ec9528cde/97309583114.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/2498675667.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e62590a55---45880928201.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/giwisoralexuj.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/26421119349.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a777bf41de0---tideseberamobezeme.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/deaa2651ee3539c7d7ab2d73eb707202/nafatanovolisalidoj.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d55c88461415812d61f51592d7a5e858/40120769174.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931ab1530b5---tizazoduzufosakulafipe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160970c5378066---korerijo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0f9cf5fe---rezopegajiwibaga.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/duxori.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef4c20802---75550916162.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/80518945902.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_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 16532 bytes
SHA-256: 2a3c41fecb9e4934f776ac21bb4981c64a84a8d06e1b0ef361ee9a4a724ea88a
font_01_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 10408 bytes
SHA-256: 8a6289925c8de6bcdc49de8b353967ef98b4492f2f96879cc0a04cc1555b512c

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