Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18d42b9d8169494…

MALICIOUS

PDF

90.8 KB Created: 2021-07-06 22:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3717d575cb9d6c5298693fefac059d81 SHA-1: 3e618b300a11d8e14008941c87b260e159248e74 SHA-256: b18d42b9d816949460fd30853f83cebf4369c10139fc11aef5a8c69003e88395
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of numerous URLs on potentially compromised infrastructure points to a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6efbd917b---vulikiwakemamevabujati.pdf In PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d9c6a60---zibelibodabidoxodaxe.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/tonedifojiguzumugori.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/utfode1lc2s7qmpfv2qo9mh50c/64661761271.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/848a72116653bd5095e9099b31bffea8/jidenavub.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/56098736226.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f622r6oatmi8u4fn140l5hgift/xoviwonaputafogedaja.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wulapurufe.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748df6ee9f3---42161939253.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/833a694a3c334052349a890329626293/zagetamimedotufagukanapi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/au02te67tvhfkcqm1rne3es7v1/weguro.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/timoninak.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/283749d032eca107d2f62f579365f593/vozagupiz.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c3757ae3---buninozagibividupis.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/18b84571e49f6be1d51771a1963f394a/paruvaxifururovimuson.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac677ebf4---37563218912.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9bc4dd552ad41b6dbd66e919e85e9137/wopajeposebebozavojakenu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608974da6cfd8---zuruxudomanikewudevevolu.pdfIn PDF document text
    • https://topupdana.com/contents//files/3528829923.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aipv8spq0m6bd5t29tk4lrto75/97295171304.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/ligasinolopidopor.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kerinobobuzojirodatutede.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/84f0b85d3c3b177a8570bc8ec58cfd74/kirarekojotiwusakojebitu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/20287728652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=persona+4+golden+all+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 17236 bytes
SHA-256: 63a3e76969112e33a9e309843fd3d5fe024b3b1bd071ee3433efd6a9673f52e3
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 10400 bytes
SHA-256: 12c614b77c3eabcbd9290033e921e845d3940e574fb8591f18d4ae7e04e5b0ae
font_02_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 3088 bytes
SHA-256: 6252479d1ae060b8c76f2093e48add2f67141892f3e05093f70c97d743994bfe
font_03_sfnt_off000145ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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