Malicious PDF — malware analysis report

Static analysis result for SHA-256 116335ee5fd58045…

MALICIOUS

PDF

156.9 KB Created: 2021-07-14 08:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf7f11a75c35cdd0e53f33765ce132fe SHA-1: f49b58cc8d0db47690138b0f740fe52e18f85cea SHA-256: 116335ee5fd58045f7bb2965282230e5fc5583ebac7250117017804b08b48464
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

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://pcstaiwan.com/ckfinder/userfiles/files/wunanikek.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4787cfb6a---mowevuzire.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/31d2d7897fc37b49617765f919da1398/zuxifijaveremerevajibise.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/13752585806.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607279a3e6dd0---80094096163.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/268c0f2201ab9b9b033a5dc88dd8ca59/92304621819.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/sidav.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d104b7fdb---7506010722.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/54edf3af3c3e821c0f263969f16861c6/jebunujinuruj.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/66150681369.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qfl51o44slr6mqor47bd1rjdn2/letogul.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/15432397488.pdfIn PDF document text
    • http://fructusartis.com/i/File/84137781060.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/tuwijariditirerat.pdfIn PDF document text
    • https://vestol.bg/files/file/53634585913.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5pdclcjoeqktbunv6sba7jm938/wasukajesewebezen.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0ded29b51640feb63b3a53642fb1aa4c/46807557026.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4a7785b64ce35ebe7c5b194f0789c1a9/51617794426.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/27002794728.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/geeqekvfm09otkjqov0p3bqh2n/gosanuxodukotuxulula.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ad7078d2---95276870660.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095228a975b3---xijid.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/75568604328.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/43ecb19d76b79aed27963a50a240c732/kekinedizadopusepix.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3tr2ujq60vhp5s6l9i0a6k93tp/49020581709.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/mv9h0fc7ar33deqbqgrrp8e5ri/49256539233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+woman+is+a+gift+from+godPDF 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_off00020891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000220a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220A8 10584 bytes
SHA-256: 90e86833b9c358ca78c959d874682ec2af87bbbe4ed36a485f890dbfd7130a84
font_02_sfnt_off000238a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238A6 17376 bytes
SHA-256: 96eac7bacc3c5123e3fd8a881f086b15c13ccc6e906e604a27f43282b9bd30d5

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