Malicious PDF — malware analysis report

Static analysis result for SHA-256 38753d52794fe1b1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba128c699f0eaf1ff3930e1e2e17e812 SHA-1: f4a5354319c4fce012d2f701ec9fa8f99b95fc16 SHA-256: 38753d52794fe1b1aff117d9d518c3c3cea2c2a7e4e6f84507d0bd0f90022ce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=itune+apps+for+android PDF link annotation
    • https://equalland.com/uploads/File/11511751652.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83831749459.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gutuwafebunivigitivawaba.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/44810084363.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/wubavurebezewuraratiji.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8c1f0715---87193978167.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/kiwifufub.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/kimozeg.pdfIn PDF document text
    • http://deforma.it/userfiles/files/muvan.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/legepule.pdfIn PDF document text
    • http://kme-kme.cz/files/file/99070868132.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd9e65efd---61270709116.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vopirigewixopiwewoxufo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/vopefobejebubuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492527ba43---27429894396.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/44553165359.pdfIn PDF document text
    • http://jfe.hk/userfiles/92713513739.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/81114911738.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/lalesawunozadudufe.pdfIn PDF document text
    • https://kermanrooz.com/img/files/perudobol.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/buxamarabipazikafawifatu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614277c3eaa10---moxesarusujudur.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/witizuxuzuxelegidoz.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/77527686173.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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 19804 bytes
SHA-256: 8aa60ddcfd97648d0637cacd09c4f3af04d0920be0b9bd28d671f0983ba966a2
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10496 bytes
SHA-256: acce68048a7b5a996ecd78788756a3bf4f6c9e48f02ae8f032957c685028a29d
font_02_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1