Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c4756b44963039…

MALICIOUS

PDF

74.0 KB Created: 2021-08-22 21:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a595f276c99feabd766bd9b8f8c18f6e SHA-1: 542635fba9a433234258898f6f6022c0cbec195e SHA-256: 35c4756b449630395dc53f6057bf723a488064ad3caa01122896821a785a3950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest a phishing or malware distribution scheme. The document's structure and the presence of many external links point towards an attempt to redirect the user to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=why+is+iodine+used+to+detect+starch+hydrolysis+quizlet PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff7722095---lepisakotod.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nobatubumogibiko.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c45cb966135ed2c6f05d92612d2a7042/vobavonifabovuzekibe.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/62702408250.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2573b3cfd---12023940921.pdfIn PDF document text
    • http://armanetti.com/images/74194924278.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/78406263695.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7114f459---66367854925.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/zapuza.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3c7cad6d---18582154593.pdfIn PDF document text
    • http://splogservice.ru/content/file/99270709884.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ff164917504c35a557f8802679b7280/sogorakitafuwabidezividig.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ffaebf52---kedumizuwogadofitilif.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7115e88c6---dodosigire.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160982ea014feb---23857092864.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sofad.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fe4e63ce52aac7fc7823babd18b23573/giziduzifitelopeginobaniz.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/48585966585.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/89658637880.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/40456217495.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/bosejegesapeweru.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/fekowaxojog.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_off0000c171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC171 15396 bytes
SHA-256: e3c69de6afd5d623dd4ccf9a648b83f198f3e0c93b289f312f993926902e9399
font_01_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 10880 bytes
SHA-256: af545965105d455856483abed467d89b6df8764918b0ca327bc21e9962288c71

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