Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bda35f6e688d510…

MALICIOUS

PDF

68.5 KB Created: 2021-09-10 09:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 190c6ea984eeac8b0415c7661b092a86 SHA-1: 6fdcd6699ece41e6f5bccfd1ad43186654e9acad SHA-256: 1bda35f6e688d510c673d95f642b8140b37e7c5bf86da036836f9f9943fc61d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/ec5d51b4525fac3f5118a5afebd2d278/lininubazodurokeminik.pdf In PDF document text
    • https://unitjaya.com/contents/files/sugomosevifipesudafaxob.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tikuvekula.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/58909841129.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/73326472034.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/kifavewaziguwamopumi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ddd1ad32c---64446159135.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xirazozunefefopupudat.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-07/images/files/86402020804.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/10329726585.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/29437801530.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/vezekabijojepita.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/57259388436.pdfIn PDF document text
    • http://sbkf.org/files/files/jozuvulonolekovixuzodo.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/rilatumurukewagimiluk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613531c03dad3---7547350652.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/5224364203.pdfIn PDF document text
    • http://metzlerranch.com/userimages/bizotolufulofujuvegud.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89083747021.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/92972022271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sana+all+chordsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ee6186d---dasumozuwibofexebidojub.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_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 10220 bytes
SHA-256: 073dca1fa67132574ed0aa1063f6c5452bf4eb6f92cb96981df7ffd2219452e0
font_01_sfnt_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 15080 bytes
SHA-256: abbf10ecd8a377a6023fd5d8a1c62737b2b1f2c26a2f1bc06e1aeb6441a9e227

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