Malicious PDF — malware analysis report

Static analysis result for SHA-256 50056cc8e967c61a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 03:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 969c524ab8cd33f6265df5e56f37b7a9 SHA-1: 39c76848167082e90a115227f5661ec7556a24ca SHA-256: 50056cc8e967c61ac0c66c898684f738be912bf1883dc52c159f2e7c3b5307a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=simpson+tapped+out+donut+generator PDF link annotation
    • http://golfvillageonline.com/userfiles/file/xisetavutopupi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/7479604732.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/98693166057.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9vnn4u01n5u9n1k5t68jgho5u5/gupezoletoto.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/59941831740.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kagoxaguvometuzoka.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/18150895137.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/padosanemufije.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/18916099542.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210909_B3599C9A0B487AEA.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109101654103754.pdfIn PDF document text
    • http://workontext.ru/media/file/76723159191.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139efbdcd5a2---59288760433.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81080067151.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zipugik.pdfIn PDF document text
    • http://tzsunup.com/upload/32537095734.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/zosazebojolinaxuvuwibup.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/26167348632.pdfIn PDF document text
    • http://mega.kz/media/upload/files/53706053852.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/17762782912.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tojekukaximesisezez.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/9567703588.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pobupozakelidopi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpmembkhi5t53poo4d55ra7ig7/demavexefijusasa.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/78f523ea75863118a655d7307a53c010/gunit.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/70272562468.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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 10864 bytes
SHA-256: db4c4f030c0d0425f726b5a4a93507a14de2ffd9dc0adabce88504d1ead24dc2
font_01_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16296 bytes
SHA-256: ba35d94d9c0aa5658f1f80df1b52007bce2816e19b88bcadf6eae488ac001f82