Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a8f0c9a02025e…

MALICIOUS

PDF

176.2 KB Created: 2021-07-08 05:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b97d9e8c8f4cbd35d2c34f46577e258 SHA-1: edf90bb5261542a0976bfedbac57f3e892a3e526 SHA-256: 933a8f0c9a02025e487485cafc51ec55ec93bc2dc095e244dba757d1faadfe69
204 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms and compromised CMS uploads, along with a lure for a password-protected archive, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a malicious download or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a3ab298de36e357630ee869241e09606/gurumixubijekemikojobe.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2vdi2aagbs8s7vb4pg97ajg0a0/698761533.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/falelitukifetutegefurebiz.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/sodanidep.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6bb6e18f2e524626c0e3fad3e0310e23/65049551749.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sekedukades.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1bc35ff8---68256162714.pdfIn PDF document text
    • http://m2m2design.com/userfiles/55529664305.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xobogigozev.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xepogu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0797b50d1d---1546075134.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10487564396.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e3da343045bb63627b8e8f48d029d4/51237609328.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tunosigeduradizekazapu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/semitifobupezosow.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/50732967924.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ad47c03---koxutojabulax.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tesusizibagemupari.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160858ad200bc1---fipepasuwixujowibiti.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086de342a337---41646518984.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/97594399189.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868744661f2---bivilig.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/12046693564.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/xojafolipuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=oracle+rman+backup+and+recovery+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15823 102096 bytes
SHA-256: c4eab31abedb552c9d2d4233c5b2cca53aaea2152b16f69979425e79941d9bef
font_01_sfnt_off000253bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253BC 10960 bytes
SHA-256: 205bfe3d846a13d09a43c00006804da3f8366fa5513073998ea61adc9ee91f76
font_02_sfnt_off00026cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002850c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2850C 17616 bytes
SHA-256: 9d2ba2eb4be90a83de4af21bf74e8e39286309bb305fe2d4f8afc488058b507c

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