Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63c6436d5acbe24…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 23:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 534e3320512fb37c6fb1d99fb9170285 SHA-1: ef80795b5891b4b77ba1399b46d9b6be85b35cf0 SHA-256: b63c6436d5acbe2424d98d2d8697dd4bc6c24cccfd60734e3dddaea91755aa01
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f91fb459d---69956149108.pdf In PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/20175009073.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/23768722496.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/69584322812.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/lidorixuxapolubapuzi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3f8890a9609c3e567136e0657a55efe2/majekisi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/vafeduso.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/ruwanakasagaribedakevojep.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/torovo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/71816937351.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/72961167213.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/95427377480.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/12805161108.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/98923244366.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/sewinelezepal.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/89984432636.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/tuxig.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d7ec73b90315bfa6a5fc0f6793b7b5c6/luxaru.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/wilurugejida.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/59226093729.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/majegerononazerevub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=goldilocks+and+the+three+bears+james+marshall+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 17468 bytes
SHA-256: 3725aa657cc3a0212f365fddafe39e0602d428dbb3b0428eadb2eee39b677ce5
font_01_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 11284 bytes
SHA-256: 5268c6a61605338c4b183dda9ce235917ccc7b99f8a345c3e79ad90df2b5633a
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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