Malicious PDF — malware analysis report

Static analysis result for SHA-256 55085e27e1f06137…

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 749fa3b8354fbd756027711a0619b1b5 SHA-1: 44d6585e3023eec0b26d571a94a83a09f7500465 SHA-256: 55085e27e1f06137ffc271c45b6762ab6e747b72427681dae79d251a9ee432e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56828b620---bigiwiwuk.pdf In PDF document text
    • https://alshaabcoop.com/userfiles/file/91024791634.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/koxizuwu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67782137989.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/nimamorunewofoneromipe.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///vumugovoruge.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8337e8975eb3cc512b51f0c615f333fe/43952978490.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7348d73069---jirozowupujifokuj.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/62472997878.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/72132260957.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/51258725161.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/45215728613.pdfIn PDF document text
    • http://mav-auto.ru/images/file/wukutasebujoguj.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4jq51i8tu32g974ui33nt6l3h6/55416913767.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202177131298867.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/43eb9d6c3da868d874fe73494094ca97/74242701793.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kodajez.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/sowolurojixusiziluxebe.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/17000281797.pdfIn PDF document text
    • http://zatacorp.com/upload/files/9529020632.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/tuzilukabijafiraxelis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=digestive+system+of+a+chicken+parts+and+functions+pdfPDF 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_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 17012 bytes
SHA-256: 7be4771cc715070445cf13406efe1f5350b79a39d7607de5900c4485a2926e00
font_01_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B67 11396 bytes
SHA-256: 06549e0e2061ab102029532920fcbe3cb0ab89e307f5721d1cd78500581d3bbc