Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dc5dc54cb616f4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 09:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecca7c68f68716481415c98d4adf49b1 SHA-1: 1376fe6358720215ccb343f39455e96e768e4ed8 SHA-256: 26dc5dc54cb616f4954abb1b62fd07ac76681b1e8e497962c1365907d0a437c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+watch+grease+for+free PDF link annotation
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/wolin.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/26421762240.pdfIn PDF document text
    • http://iccarrentals.com/files/file/jadasubutixomabowo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109044851_239730008.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c551b7b1c---tarojegilomuzakanolaka.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161380a57f1bae---61084154124.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/84396087912.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/ninezupekul.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109022013486016.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/08970bef4d5463ce819c603a09913df4/75094421327.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1c31d66---22633286839.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/8503634326.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nigilowanewupinivefa.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zibom.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/jikemojisabopimojuzenija.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/sepalexebegafa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b292d8a2ce---86302649424.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/nopifugixebirofotezaj.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee9825ead47a231fe15f092d3a49b13d/77553390412.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/54265613562.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/4147407892.pdfIn PDF document text
    • https://costarica4d.com/contents/files/79728882748.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/12097797313.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7705eb7b11cd231a1d816d6783ece22f/57061781566.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/lobakotifuzabijalamegetu.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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 15300 bytes
SHA-256: 7fdc3c35f77e37530db77ed1893444f3f73397e77536b9568519ddcc6ac9b8d0
font_01_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 10452 bytes
SHA-256: e3c35738853d91f464c035bbd6928f7441050996f297899e89e84d79618c1c8e

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