Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3e041cda81a604…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 22:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d7f1bd22420148b5b58c0985539031e6 SHA-1: 1254d4bae0830bb37a1a162eea25b85526c3e1b2 SHA-256: 4d3e041cda81a604e09467df68648458c8695e1f56f5608781dcff49b04665fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=early+symptoms+of+tourette+syndrome PDF link annotation
    • https://censcakmu.org/board/file/files/novakafajufef.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6019488b3e---varewibasagiginanunapog.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/zukufogakodavu.pdfIn PDF document text
    • https://yellowstonewildlife.com/5132860801.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e56422fe5f57a8d8691d405ad21a164c/61279900669.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b23307a02b12c45203b09dbc7385fecd/35253855757.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gixusixitazoximirit.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/39946782529.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/84c0ed29efe67ab2d630151a33273e10/mafonogufuxud.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e32977088---lafamuvekisexijilujirovat.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ab710480126fe6ca7a3fe27fe7937cf6/66269693219.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad01025d2c0---rurikifunesakekoboxubaz.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/fidezazufizasusex.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098621b4f022---664123882.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989cc2860ee---63806777374.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/lalopotifopikofej.pdfIn PDF document text
    • http://htwy.com/upload/file/32715104098.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807d19250d4---zanopukeze.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/97078240306.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/famigowazigilobudut.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bopuverufidebezozagixamub.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/sktdgr1jbp8gehcftv8hgt7ifl/zotas.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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10764 bytes
SHA-256: bbaa6be76a79d627413c4e344836c7df82ad90a1b5d477cd67b4cb06108b91a1
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16312 bytes
SHA-256: 570f4185e7929c60cd2abe88771e0c3b5db3b915313f85c3a85c4936a7577243
font_02_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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