Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e9ef428050df80…

MALICIOUS

PDF

84.0 KB Created: 2021-10-20 04:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8dbd9bdb30371560c7271e57343ee6c SHA-1: 2b651410ac8a4120d83ab69ffe4f0e92fc36c710 SHA-256: 02e9ef428050df807fb8cf9816016bfa0d60dc7c854d72bab19d32d3740ef148
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://cloudinfo01.smartevolve.com/images/ckeditor/files/leromoxipemilikuxagus.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/13892055799.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/pokofekuvesamuwu.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/32086144909.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/vupizir.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/48372231207.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/57641467394.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1616f326861d64---72742588940.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xamutanosab.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/vitemugodefote.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/88206384290.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/jijasanapawu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/gubutawejiwowig.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/92e0463753c253e1936784a6d5f330d1/61560656604.pdfIn PDF document text
    • http://zl369.net/userfiles/file/30045829135.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/38790245378.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16167998a6a3ed---wozukubobibenopamidexodib.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c2dc8c5d5---4955801561.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/67233234969.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/tipitetorobove.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/85690764420.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/gemekowewor.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/16251858607.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zofir.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pawopoporenowiz.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/roxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=how+to+import+sketchup+to+blenderPDF 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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 11028 bytes
SHA-256: 492cf4b90a439c13aa06ea065deb69e9c0e9614da252f80cb62e0ae1d7c92662
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 17564 bytes
SHA-256: f49714a5ab47e13b31b70ded1f8637df720da4eb6c37c6b9c2cb20792da345f0

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