Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bb15fa2ccf05fe…

MALICIOUS

PDF

90.5 KB Created: 2021-08-11 12:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7036d4e4ce12b973240066268c90e46 SHA-1: c02b3ca52675b551c9d9c7ef92891d96f7004924 SHA-256: b5bb15fa2ccf05fe059150ac359639da38e78f35a47916b4e76f33490c8bc5ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The PDF structure and embedded URIs are consistent with exploitation techniques aimed at redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=libro+el+aula+diversificada+pdf+descargar PDF link annotation
    • https://angkortaxiservice.com/userfiles/file/70095294267.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/xopitazuxugared.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f272b4ea---pijajelex.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/mimitagesutupod.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/03c10e3cf5942cf387ecae0a00ba5213/99445376524.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7121c571055977f6c21ebf4529525c90/wezizisazafos.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/kudug.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56173e781---78545360526.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/sanalekufipabeluzasika.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668c62c201---85388593701.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/66714477432.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4ce69ef136f36baa941703e3a66c1732/xixuwunofuvipod.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/29389712544.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ffafbff3d13---33813711248.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/gijonofigu.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/89270161832.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qekpdcpk1tcm32ijnfuanjsr15/wofatumimezulo.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/medawazoga.pdfIn PDF document text
    • http://gonguyenkhoi.vn/upload/files/sufuloragorozavenuputuzu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/46001483617.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/12789956996.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/53576242456.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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 18372 bytes
SHA-256: 36989ea036fb50e0479a3cb25956397f35f2b680b2053e2bb73d268ffe44d092
font_01_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10856 bytes
SHA-256: 5e57cf5c59245dcfc4dd24fe6b32b546ea82546d532cb9fc642e3aff6b22d819
font_02_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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