Malicious PDF — malware analysis report

Static analysis result for SHA-256 9118a03b637b1cab…

MALICIOUS

PDF

101.6 KB Created: 2021-08-18 13:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c83716e7216de93a3d4ceba4dd86a3b SHA-1: 0832299ba9f35922a4726b3c5acb5996b99839c8 SHA-256: 9118a03b637b1cab02990ed3591311b60ef411e99d4152ec00edc0000bbc4263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecd855286---65722534764.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4fec0a7f---xomivotinojad.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d68c8313fe51a59552154de8b9c3ea54/lefomitumodelawuwuk.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090593d2d5fc---begulodewevurexi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19c5a2c70---xukoxaturisob.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/rolavuku.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/73477745858.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210813152545.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052410424573499.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/53393139694.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9726f1e2---gakasonojajajufiluzejer.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/q73fh9h69sc84t2ie10j6l7t1n/4423989245.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/jogiloseropenabepovele.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffae0b24400---97205899243.pdfIn PDF document text
    • https://dafelia.com/files/45950283026.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/di9j9tojjsa0oemq3e0jvi6jn4/95450371461.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/81688547131.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/83429054490.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wukupokixorus.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623781358.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/68354102515.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vulanunoxagage.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/viwogit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+tame+a+wild+tongue+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_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 18356 bytes
SHA-256: b801e05e673d61bb04a27930c2909c9cbd468a8b34e3284cb73d21b1328ea597
font_01_sfnt_off0001562d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E44 10748 bytes
SHA-256: 5a267a310d93c00b182bfcba2f95706c3f3ba418df1200033fc593ec52415312