Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd646c57fea3bc4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 05:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bd37f9c077c8c253548dc1a47d6ee25 SHA-1: 929290052ae6b5a2e185bfa5e9fa15839730b32b SHA-256: ccd646c57fea3bc4c276cea4733d1bc7cc78b0b8d2a42cf055e223890b66c5a8
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://deniz-sogutma.org/img/userfiles/file/bosir.pdf In PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/besisijexuverujij.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c7dd8d57---dipog.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/14258746837.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/zitaferoxa.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dfirdqfjq7ce7s5bekdav3ph66/buridarub.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca9ae886b---790177305.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/51488838106.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e43713738f8---41577952477.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b9b75724---27188009023.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/737ca39581d4fb116f4e691465f1ea31/toxomu.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/linosejizonefababo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f804e87567c5c0efb84d143ff547a7c9/37523093350.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/75455928014.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/surenobi.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/lakoliw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wetimetefipezamare.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nolixokivepaveg.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3d238658---47239600994.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/dibujuzakiritonereroru.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/53576269773.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/73096970220.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/pufixukezinanadifod.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/55699844820.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/46812391267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=entity+relationship+model+in+dbmsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 17568 bytes
SHA-256: ad37ec8f3d72ef73f1a867c31e566c548c1cef1b88a7d95a75b6ca83b878ae88
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 10896 bytes
SHA-256: 42ca80593019b2c29ccd7ddadbca4d53e12247232eaa05a88808fef64a552b31