Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cacf18029ab932…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 12:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e56013ffba9d369a67c21d9a82bb1d2 SHA-1: 81fbddd915ac54d6e3508784794f9e38f9067fbe SHA-256: c9cacf18029ab9329c45de7ff160be1cb84ce7c6e8239691ea45d98144ccd57f
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, directing users to multiple compromised websites, including those hosted on disposable domains and WordPress upload storage. While no executable scripts were directly extracted, the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest a phishing or scam attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161359022b953e---pobuzibamavalo.pdf In PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/juxipowixabinezak.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/milos.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/fuwojikovosubimivu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/nedunobo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff83eec75c---tukiwetugenidadeped.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/dexowi.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/damevudaginesizi.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/66735698235.pdfIn PDF document text
    • https://bloc-immo.com/images/tadokojolekumutixoba.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/12204398282.pdfIn PDF document text
    • http://normel.org/files/upload/file/72229952502.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/defulonabanepula.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109180222372848.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/gisebaripelakilixuzemup.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/burixiponojuj.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/30928667160.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b8b6b1374---konisazez.pdfIn PDF document text
    • http://infunplastic.com/d/files/11357379626.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161408cbceaef6---kabozejevot.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jevotonitolezuwizinev.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/30192600335.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/4207048618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hole+lotta+lovePDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 17636 bytes
SHA-256: 5bef805ca483a4a7120506ab025328c0013d7ca4f132c1bcbd187d07286f5fa1
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 9692 bytes
SHA-256: a5e0f93e5a30fcc28338e191365c1c2311512626e3da9a441ee92c74451eb6a7
font_02_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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