Malicious PDF — malware analysis report

Static analysis result for SHA-256 7356db28a24c8105…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 03:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1185e599a6e94bb002fed2ad2dab60d SHA-1: 4019bccd4467d558e76c52a7f0e8c163cbb66703 SHA-256: 7356db28a24c8105e929923fd54cdf9d602c840e649773d2caaffdf6e14ae40d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=poker+online+uang+asli+android PDF link annotation
    • https://houstoncoinshow.org/FCKeditor/file/65492854445.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/worusisoxujam.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/55298963772.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b8q0b847cjcf3j7toh5u6s8vgt/58420654408.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/lekotufifiduburasowilesu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219101054437727.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/94563582107.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/82986614898.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161359d35efb28---zomupow.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/27376154057.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a873b841ab---86787883416.pdfIn PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/67000258551.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kiguvekukaduliwixiset.pdfIn PDF document text
    • http://starma.pl/files/file/86617170265.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/sajivenuguruvumilijo.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/84472630768.pdfIn PDF document text
    • http://topas.lt/userfiles/file/kanir.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/xawuxogizutelokixepokar.pdfIn PDF document text
    • https://tele-video.ru/upload/files/32003055039.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/fapota.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3d7ad5ea9f0e07dee3531f697adedf2f/virojesemevixifesovet.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/bibalulufixumidunek.pdfIn PDF document text
    • https://amgaa.org/temp/files/69389414791.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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 17680 bytes
SHA-256: 577fe68707c9c259541b71bae36a4069582b29f88935364ad9c47a2b928a81fc
font_01_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 10516 bytes
SHA-256: 0b2a497f12b15a374442c37e334c510e6d509d70a82e002d9a249db56508953c

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