Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ef62ea7ef5f58…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 23:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dd6e1a54ba9faa3f0168bfbcba0ae3ac SHA-1: 7a3d28e5b52fb9856c91d013ea4945239f0dd3c2 SHA-256: 3b8ef62ea7ef5f5842261b8e1969597840e3250227fd9bb0371b9762d62fdaf0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 http://life-worldwide.org/assets/uploads/files/sonidupaza.pdf In PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/94942609193.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gilej.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/botipuxasiku.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/84503801694.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/32557964465.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109090745488808.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b15a09c2d---27439545785.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/88981981309.pdfIn PDF document text
    • http://104408017.linker.tw/files/8653765618.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/17041510803.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/96605616494.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/keselawojumegiwe.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/20166721583.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/kelaleruvolatakumemim.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/86020932918.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/mufenonusototubeginowab.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210907_034523.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sikavibalabexedapazar.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/3743697777.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lovetijul.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21ed7d97d---rewuv.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331adbaed7e---19970876115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=root+android+motorolaPDF 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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 17240 bytes
SHA-256: 01226678b611138a2e0d05b7ee4b1d53d008ffc405d1df5084963ab3b847421b
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 10156 bytes
SHA-256: 88f96d705f6309a52e245846c1489a92f1ba0f8a57bb272682b75c59145acaaf
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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