Malicious PDF — malware analysis report

Static analysis result for SHA-256 51566be3284d60da…

MALICIOUS

PDF

89.5 KB Created: 2021-07-03 07:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e8fcdbfd6c313ce25ea557abf9a2bb6 SHA-1: d01fac9b5f05c1f9f6b2d8e3a4768f76d2716190 SHA-256: 51566be3284d60dafdd13b5ca9dbd8ee657e0f48fde54a012d57698625343c5d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick the user into calling a phone number, a common callback phishing technique. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to host or redirect to malicious content, potentially including a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds8iivk7elbu7b7ev5067c63v9/43792898681.pdf In PDF document text
    • http://farashimirooz.com/files/mafoxagako.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/86186039136.pdfIn PDF document text
    • http://muszempilla.com/files/file/xezebiz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609520e33cfd4---limiboxenolejipemawelulu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mufosej.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/92a61d614a605e267098937a6e43df4a/lijixo.pdfIn PDF document text
    • http://gdgom.com/upload/file/210617201549821717x04ghnehxdo6.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/bazivete.pdfIn PDF document text
    • http://intergeored.com/upload/File/55537024256.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4664d1eff---gotedokefidederexese.pdfIn PDF document text
    • https://onlinendttraining.net/files/xajaxapijapiwa.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/27176521435.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b2977553b8e9a5355ec52565e7784139/88326610584.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/duzegewuxalopatiko.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef8527e67b---menujufabonefagenad.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7575624a---wozidewe.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/65041586927.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tkirthhee140bkm50fmecfmpv3/48284958106.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/44848514100.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/35c1f55585983ae4e796cb719d221328/91535357808.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/18f1d80c73d07ebe1f8e06a78c056eee/tusimev.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072546fa3bb7---80645156721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ford+motorhome+chassis+manualPDF 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_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 17288 bytes
SHA-256: bddfcf069c54646866dac5d1d8b2533fd43dce5c3e07eedf7cdb79e6a6e31b61
font_02_sfnt_off00014063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14063 10712 bytes
SHA-256: 4d6a93f8770d4eae31dcc3b1a05a32deb5c032f258345e976757d66051196db4

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