Malicious PDF — malware analysis report

Static analysis result for SHA-256 33301fffacfddd1b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 04:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9f241602ea396e9a588d2afd74f616f SHA-1: 44405a4751551054df905464e87afa1b54d1a6d9 SHA-256: 33301fffacfddd1bfda06838d25286acd9ef16bd23ee9a3e4f89cccabbd7e229
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+get+pokemon+emulator+on+android PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5581661c---watobadigivadilemuteda.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bebuzu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b829e5f00---xubotugilowosebebubisaxap.pdfIn PDF document text
    • http://thepducphat.com/upload/files/86176597348.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/vifosozorogaxakokaju.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/85929908433.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/78924032866.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/gujotofibazitexo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/61321658618.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/sitenev.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/11871873115.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pemutuvivirus.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/43243111990.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/89599266333.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/239645804.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/12675402997.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/20215396421.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/dafevomi.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/luxekuvitefo.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/8671001141.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70313626218.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/tekapowina.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9d03433c---sufizepuxubuxo.pdfIn PDF document text
    • https://icbacademy.com/upload/files/34600305328.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109102252428746.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_off0000d38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 10836 bytes
SHA-256: aa3940847a270d5276796657b97bda0061fded5aedb77860165ba73793f622e9
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 17636 bytes
SHA-256: 522a35d9cf5e7f38be5fa50944a5f1f9fe9ff9e00012b851711fc1db7ff87b8a

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