Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b81c0348202cb92…

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 20:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 289bf86b6528d06ec4aeab71538fff99 SHA-1: 1ec87b12861b6bb4485e7e4a5f31635863af9886 SHA-256: 9b81c0348202cb92cbd1f1a4e2c2f84feeb647cc9ff7c9347e8dbe1454e23801
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://smidgel.ru/uplcv?utm_term=are+dunkin+donuts+blueberry+muffins+healthy PDF link annotation
    • http://wernitznigg.at/files/47129471034.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c5a6d1f0172964e70949e324a5d1bfd3/kefegevijawuferapegatufoz.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/87083070152.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/55990153401.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/22723138893.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23c057b51---90181172865.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/76495176525.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/51373231019.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8eba5b9a91081277f5547ab836c38147/rowuvudova.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160edf55b066e3---52927082741.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/liwalisorilute.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fc8eda811ab4660b05152bbd38d61d5d/fexotisagolizes.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e765d161---vijerul.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/jamozix.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/58792782778.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/44599007458.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160d462927a630---nulexe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5800e21b6a---rusolamipepud.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efd573f11---kodezibaku.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/3188170499.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a25cfaa4---luzaligivugejokibasavit.pdfIn PDF document text
    • http://kelvista.lt/images/files/95054654200.pdfIn PDF document text
    • http://lucann.com/Upload/file/fanobu.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/7858450673.pdfIn PDF document text
    • 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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18436 bytes
SHA-256: 44089a1569a1bea8e31637c4017202de5bde23346e874cb4e85ee94e54c75bac
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001390f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 11048 bytes
SHA-256: 56801583e53e41caca36c9f477c367ec2f39b392e260fc7d068bcfa625e23a28

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