Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b35fe916f95684b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-21 03:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7af4ecf27689dca97fc3be2ffb4c8f00 SHA-1: 385f832fca15eeff8049920961c30c001e7c75e9 SHA-256: 9b35fe916f95684b5f8b2938159080b7a54c4108d2ad4a52cb6fa9a4eaf49af7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links. Several heuristics indicate that these links form a link farm, with some pointing to compromised WordPress sites and others hosted on disposable domains. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for malicious activity within PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://chizclean.ru/files/fck/file/kigifolozegovok.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2d440c04---perowifu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/de4c63e7a4e91ef0093f4154c0b61134/21132857618.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a01e352d---funiwinilatufiwapakuto.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zavifemilovuguxad.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4hs9sb08ea6ihk62u3agonlg8a/bopexonosodofibinat.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/70792941672.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/05ab8ea9bea65794974164d277ae0959/feludelukeledali.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/govewisozorinomizevoro.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6ogfv3eiph7hlbp8j6u4gkflg0/76486418054.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9dff082a3923c167d29d2a0dc758b852/kezelabetemajo.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106111150350649367vmyh5.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0f7754336af7fb689260788e79e3937/73283200640.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/80340716785.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2b660ea9---90412076334.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a563faa222f5a5b249cb676834c251dc/79549485602.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/gomadobomerunosipojuz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ij0jndsrkjphtcpg2k1id4k5l7/36924724169.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db941de61---zinagolaxesubidajifefupum.pdfIn PDF document text
    • http://artside.org/data/temp/file/baruligubun.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/xizikoteraj.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/tevemixigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=non+living+things+that+movePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16756 bytes
SHA-256: 784b890f5d1172e331e496dea0ab0b78866b1a63283173ab1ef0fd7a240dcb33
font_01_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 10496 bytes
SHA-256: 49eeeccc4c4aa93da0c51144c6063b35bdcec7e40411dc667d93782ba74b1849
font_02_sfnt_off000143dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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