Malicious PDF — malware analysis report

Static analysis result for SHA-256 950c59c7c4cad794…

MALICIOUS

PDF

87.4 KB Created: 2021-08-16 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 35be33bbd5387ea5e6cc26bb571fc1e5 SHA-1: 29b5ec40013e52bc1d929ed6812e613703623a17 SHA-256: 950c59c7c4cad794c395bc25bcb4af7a54ed0a06407fc83483f7d5f25b3cc5d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1b0f53314ff0d4287fbb5d546d813aec/ronuwuvonitimutubo.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608443a826c42---7044351834.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa0170b16---17988751477.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8607653502.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/kusosowodoja.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/99001106626.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9404a9c4cd---dusabowo.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/penizefakopile.pdfIn PDF document text
    • https://network-italia.it/file/94231195268.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/modepugefelomugajunigax.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9f076a71910294066a381d9886414735/91998598214.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/lutigesilevebuxez.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/172011391614.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f576498ddf4---vogiliweji.pdfIn PDF document text
    • http://orrizon.ru/images/file/45675073495.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd78ce43d---wuwuw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5b271cfdd58c654810250a626cb323ed/tazoxumov.pdfIn PDF document text
    • http://kdekdyjak.cz/data/58098970169.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-2/20210702082723867575.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/refivusemuzevalafadovipil.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/9497463342.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/gexaraweteredega.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e740e31f0ac3992f49da422c5a8ec70a/mujutogolopetobinafamijo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/84530671053.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/94198778020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+horsepower+does+a+t190+bobcat+havePDF 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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 17260 bytes
SHA-256: 6dba9348b12990398316f2a03a4c3451c401b88112979011b0606377fbe8b488
font_01_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 11380 bytes
SHA-256: b86a576c87c730b22d6370ff741fedda460359bcd1850d2c5f252da4d9c7ab3f