Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b23aabe54ca43e…

MALICIOUS

PDF

83.2 KB Created: 2021-08-24 19:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eacedf1cd551f28d19c02da80ce1824 SHA-1: 83bc10366d8c6cb2427530b0e9f382d60e9fc272 SHA-256: 53b23aabe54ca43e5b2c73db1bd5a4f4c31bc4eaad63be4128714d2318cb1fc1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead the user away from the document to a potentially harmful site, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=royalty+free+figure+drawing+references PDF link annotation
    • http://andlupa.com/userfiles/file/joresowupa.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/tumifur.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b72481609---43437126452.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/zogidejuwunara.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3648a2ba8---45706126466.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rarinix.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/satojuke.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/rovelivunidavipupakola.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/47854907079.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85307afdc---9436612163.pdfIn PDF document text
    • http://industrialdevices.in/uploads/peponasazimagub.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/82566317324.pdfIn PDF document text
    • https://wecareprogram.org/images/file/4309011869.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/67b2c8c5a8632b79e292d01589acec04/65234090137.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/14074327143.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/kakipirofegujesovefima.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8472969ae---tekujavedonelowejogapebax.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/pifejipesizevomutem.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/56501275184.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7632721a70624626b1188ed1cd7b4cb/beremifilusodivumesiv.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/mukud.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d42224c9eb5e9d5010273813112e6fa8/72318335595.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10996 bytes
SHA-256: eeb108365ab62676c0c0e9c86d8510efe9c0d01baf3ff5acef7ab0cb61014c95
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 18128 bytes
SHA-256: c759328b9afe7a1bac5026412b0a4b94684fae3adb093e50e33993fd0c877d74
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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