Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a5efbc67af488b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7df582c0561da5ea63b58b680f5c8e58 SHA-1: dc4b02c947e9354fcf4e3734cf31b7675369d296 SHA-256: d2a5efbc67af488b677183e66e80b43127aac788ce9b2f896066406400034241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it's part of a link farm designed to distribute further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=cummins+diesel+generator+service+manual+pdf PDF link annotation
    • https://preprodpcb.com/userfiles/files/bevureniz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf0de7afe9---wixugexusemeril.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/kagivifovag.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/29777661024.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fea7e75---bodikovanajobubazisalow.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609769db3cbb8---17078319310.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/90941886999.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610beb22820d8---35022964127.pdfIn PDF document text
    • https://cargotavio.ru/files/file/vorit.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/diwesixo.pdfIn PDF document text
    • https://mmszke.hu/files/file/wudojibozika.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43ab48235---42518645408.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161246482d089b---21050865916.pdfIn PDF document text
    • http://jarosi.hu/files/file/vozumofikifejowiboj.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1urssn03urg15t1k42q3pfrqi2/xegepumegejopug.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krer31v4felvvcdun6u6g35ope/56377306593.pdfIn PDF document text
    • https://wsbtitan.com/images/file/40503618103.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/8897992242.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/rufase.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/896734a96b4c4ffd0d2550be906e1871/37739467866.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/mobugokugapewolaw.pdfIn PDF document text
    • http://unibox.lv/files/text/buzufonaduwibiwexudivir.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/46989653396.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/nimulusudik.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/delesonomomat.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 16764 bytes
SHA-256: 42e69bbf542fe0b82de97e1de62be952fbe1ad5a53f9cd22c4a0d403cae5e1ad
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 11160 bytes
SHA-256: 17470c2fd21c6ce087837fc061ac2bc30fd850a5f9f949adb33aaea0a979be10

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