Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30057e95e95ac6a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d81bc9fcfcaa61f819ff7e168dae76b1 SHA-1: e37b23ce230cf729ef71e4c38e3f54f35ce43c8d SHA-256: f30057e95e95ac6a8920546948e04f88aaa5ac78b28395ff665f01316aa2ccab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest these links are used for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=aplicaciones+para+celular+samsung PDF link annotation
    • https://amrapalispot.com/userfiles/file/76172136567.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/vatojupowuxisivibep.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/jagagixakuzazemadusig.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/102046868.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/pubeledanazagomodofe.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210915210135_tjgong.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/19528758235.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///80182838195.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ba8f28c5a9693e364943ea38feab7076/47552030222.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/19017902189.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/86472919534.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4d854fb8---90137128867.pdfIn PDF document text
    • http://prestopc.it/upload/file/wuzidajapivewokofa.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bojuxaxujo.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/gomokuwovofoneto.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/fetimi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c111e02a6---misunibifa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/62b0bd39b4d3ebd4c8d93b8985cb5da9/topalivutipobizezoti.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/53326853298.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tupaduwobilorazabumekobev.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614298e281507---zobekubunugas.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613693522b473---suwarorexexeluxak.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/vusirekuzemumukuvir.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_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 18492 bytes
SHA-256: 923bb22ac693511904ce1440f8b417a2c4bb5df68f66ce63ca79acc34ffed162
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 10700 bytes
SHA-256: ecb991f547182744281cb5eb7b9ca35b931c63391e50b51582f79c5aa88df44c
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1