Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b27fd347c76642…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 16:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a167e914c8af8e5dd5f174a2940be484 SHA-1: f8b8c79a630f04bdc1241c46b917712a729975ee SHA-256: 91b27fd347c76642ea2e12a89cfeb689db16b07091947fe68dfb7ec0b01584a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=cyber+security+chapter+7+quiz+answers PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/79cb14738305f7207a03f2065341b92b/kaxukavuwivebi.pdfIn PDF document text
    • http://safetruck.gr/images/file/16021052100.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/15716116032.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/78590354653.pdfIn PDF document text
    • http://telektrans.hu/editor_up/30021981484.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81911763453.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/91540767837.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909010636.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/89191946846.pdfIn PDF document text
    • http://www.77ice.com/upload/files/poguribugeju.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/meninixuwajaseradukegelo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/legafupizotimogodata.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/difetupu.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/26685695356.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d693d6b77d71b3b93c9c743e64d47c63/45597087173.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/vobuzepirasizane.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/sojurexagogojizuziw.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/sazapa.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kuwufufasevoz.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/dujijufuwixetisim.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/81291266261.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/37007989500.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i05v1av5cs7vmht084udmrttk5/karobazefudusovedulewagup.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/wediziwujonufotosidabiso.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/20826521808.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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 15360 bytes
SHA-256: 3a001dd06c14c828a84c1e7ac0447680635f23cfb2392bb109b5af5476a3bd65
font_02_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 11032 bytes
SHA-256: bfc37272a6552369d76085e15e9955f5ce0aa142a2484bc64e309f7dd3eed900

Open this report in the interactive analyzer, or submit your own file for analysis.