Malicious PDF — malware analysis report

Static analysis result for SHA-256 8767a8677f4f52f9…

MALICIOUS

PDF

91.3 KB Created: 2021-08-08 14:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 979acae38f495cc53a70ca2b7a1c0c7c SHA-1: 187ef163b4ff4c196f6534a7bc0bbc67f3454119 SHA-256: 8767a8677f4f52f923e183452c88804a440d411c25d2ba54d1ff72982cbd4df0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure for free software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=halo+3+full+game+free+download+pc PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a483f4e1---xisasixajedekinoma.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/10b31202c7aafbee63caf5a347a2bc35/luvadinemiz.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/zaxika.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021512057245232.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210802204906.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/89850858098.pdfIn PDF document text
    • http://wsm.hk/images/files/vowutalovorexituxoxe.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/96156003495.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/11994285761.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/26375607024.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gezor.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/koxizerenogusovufegukul.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/lufur.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d125e519f76d9eb7845e484325cd877/16231461112.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/75775716215.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xagaxepabiteremadekisixem.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/50095177422.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/79038105574.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/74550882392.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/22746934032.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d2ef3640---tuledem.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5751c321e---70450132147.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06838649c---tukivewozufaboresufep.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b209eae16---26855869359.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f29f19015---tegufizasoboxuwagoriruver.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_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 17048 bytes
SHA-256: dfb63132ac421b11839f5242ca275e36ea81cabc16984852818d00a1c0d7aa57
font_02_sfnt_off0001452c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452C 10956 bytes
SHA-256: 78e2e26227ffe351a8051063919d52f932dbe9b70f6269bdf4821ec511719c6d

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