Malicious PDF — malware analysis report

Static analysis result for SHA-256 df06ca76b68bdfd9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 07:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00e15165c2c6a19b9373b1d5595f76d1 SHA-1: 0d7d2c59eb2c250735aee638da749735698680d0 SHA-256: df06ca76b68bdfd9774f8220977f7999aed5ca5a6dc59cf5ab5eb2c51ebe0b4c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and is identified as a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=earnersfx+apk+download PDF link annotation
    • http://446888.top/userfiles/file/51880177262.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jewiwekuninotonalisi.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/11978649658.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23135857889.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/58297895501.pdfIn PDF document text
    • http://rcot.by/pics/files/rojoxetajunivaj.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/pumop.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • http://hexindechem.com/upload/files/lojivodotarobifudoluluv.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pexesilomoligipavip.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vatibu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/refababafekopurogobozibep.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/95ef99518fb4a501f73ed2d64dfa62e4/80614215905.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/jurowirekitadaz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jagoba.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/79646a35217896af91da95cf922534a8/denasuxulo.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/49122903107.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/geturofupirapotaj.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210901130932617389greu5h.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/18374888821.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/magipegen.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614429e8a9535---xobizibosotunazinerinuleg.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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10564 bytes
SHA-256: 053ca4f69a1515f2c2d5c03f0b01a50f9cf1face1134580be5f0aaa2256f5197
font_02_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 17868 bytes
SHA-256: 42f5094cfe4451d38a7b839de7601c1d317dd51648db28cfaecdf4b6872a4111

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