Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b6ef0c029aaaa7…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 01:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1aa92057208bd8cb9c14a5145e81e7f0 SHA-1: 91617b5fc3a355c35216989b3be339732e3e79d7 SHA-256: e4b6ef0c029aaaa78b9dfcd00d70ca51a088b45968d9729a03485f6b25b31a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. The presence of multiple links on potentially compromised hosting suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/309140ddd2fd85f0bddcc6da0458f9af/nufuweko.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ba164a081bf6a350960dc6e49040d540/keloxujerobewuxosoriral.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/falasakuduxifizi.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/bajirubumetofo.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/70218008529.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1489bedc7140cacb37adad8c365155ab/soxonebogusebimijaneru.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/92259089942.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/32419358022.pdfIn PDF document text
    • http://teplospectr.ru/images/files/zorabovodot.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/wiwusatabajexile.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/765horeeaeskr8pr7vhk0ur7c3/kawoninowijokodabewimulof.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c223d4f9a3---825124416.pdfIn PDF document text
    • http://www.77ice.com/upload/files/putevuseg.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/30960107098.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/zinomomavodunovogewupu.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/83378386097.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/60504452083.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/98f31a9e50bb43755e13921d9b4a62c8/22729377830.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/16531768653.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0bdb4b23trqq8vll951stll2q7/jugagaloke.pdfIn PDF document text
    • http://skia22.ru/pic/file/wuvamopiwelof.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bulojilojokowevuwowu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e9565eebb29775ff3e6d5b6a0a4c0fdb/93141166751.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///pakaribagofokapugibeduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chapter+6+theories+of+international+trade+and+investmentPDF 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_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 11028 bytes
SHA-256: 34293c9c0dc8361bef7320ff4f9ed67f9a8b6819c0f74282ea13f2275010a732
font_02_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 18896 bytes
SHA-256: 6ee3ac2661ad4c2104ac1c79a03e5e95b4e8d238eec16b95794ebbf36b20808a