Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5e66e5afae2394…

MALICIOUS

PDF

84.5 KB Created: 2021-08-03 07:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1bf86131360e29b54c0eed95204b5d8 SHA-1: d7b8e3d49457e5540193ed234844e53b6847bfd2 SHA-256: ca5e66e5afae2394b1160e468ac52689559c0a7fecbdc3209361ab1030b87700
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b35251ac0---zujelixorufilagipolokevu.pdf In PDF document text
    • http://simonide.org/userfiles/file/duganexunafezapafixore.pdfIn PDF document text
    • http://strandedtattoo.com/file/saget.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/jarizafatorabotawa.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/36e32b88f5c729db071fe14a35c08cbe/5965641300.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb6fea74b---fiwowalurozugomokabisejiv.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/85dbc8ed1317be9047f322d3d976ddc8/53678699592.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/govatajeku.pdfIn PDF document text
    • https://efnnma.org/files/file/42673645131.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/b21t3onesvp9ovi82n144897gv/mewarewebejusifojeganumo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa016ac408e---gumemimapetebe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c04a911d65f40ae6f1f333a90650929d/zazodimujazasiwire.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc538bb2d10---jovijinevuxudenam.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/83018103876.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2a923b50ae2c730d895b344505473bc0/vapujofujokesebilid.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac08a9d3db7---kawetidelefebafedanig.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44016862799.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/fizorazonat.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072daec267df---63006319003.pdfIn PDF document text
    • https://haidangpc.com/contents/files/vinezisi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/a9484a95765a59c521a6930e90175637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=tyler+florence+pork+shoulder+roastPDF 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10892 bytes
SHA-256: 4581345fa206e661d30195823af1da8d73406ff494480275de2fa1ed4663c92b
font_02_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 17216 bytes
SHA-256: 05d07c880a396d20fd356b0f4a1b9a18e4de4181e2127295cf11f9c08a86e8b0

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