Malicious PDF — malware analysis report

Static analysis result for SHA-256 66591179f693be84…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 05:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97ce83dd3d53b65cca3cf4ac11d05333 SHA-1: 91ecefb255fef72a92edcca946e3bfd0d7396771 SHA-256: 66591179f693be848f93d381439e80b47a11050aae0d96bacab0a1cd11ef9d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites, including a specific link to a PDF hosted on a compromised WordPress upload directory. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df615d560---73943801556.pdf In PDF document text
    • https://medtek.vn/storage/file/66951343775.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b4c4e60a306967124cdb6e18b7c6be9e/6536772876.pdfIn PDF document text
    • http://ned.ru/uploads/files/16099489204.pdfIn PDF document text
    • http://coffee33.ru/archive/file/fimimavawulujulo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/91906682739.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/girufog.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/upo91b2n9f38sed4ir487bdj4k/41172411526.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/midasofe.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/viduragoliwikeb.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/63056342684.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/7137301460.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/8a7641e0a7eb0ce26276c94fcb51b415/wefazetefado.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/55bb0945cfa0beae0a9de233f5699fbc/22458985449.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12622426272.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c99b9642e---14755746684.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6be02f14---16255692083.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110352d69322---tuleginilimezolenubokit.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/19459212365.pdfIn PDF document text
    • http://mmt24.ru/files/file/73034901424.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/golafub.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/luzided.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/23272532001.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/31411538895.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/javenelagike.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tanibazef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+marshall+illustrated+encyclopedia+of+dinosaurs+and+prehistoric+animals+pdfPDF 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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 17448 bytes
SHA-256: 3d3cde6ee24d58f0a1c9204adfd3e10d1ca1539c96e1eab6ce06cf353a997bf1
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 11064 bytes
SHA-256: d8e2a4663f9327074c0801d9e8ae61a013c3c5ab09265e0472c2c4c9691a12a2
font_02_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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