Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a48b8e08956043…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 15:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db527c0bdd3c0ac315606661e9d0d1bf SHA-1: d2e6694a05e49c982a706e395ce5c7ba8af852e9 SHA-256: e1a48b8e0895604333b6e4017ccb2e6ed24e914aecd5b2e9c0af91fc153d6e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161319fc4bec7c---75590217812.pdf In PDF document text
    • http://tokstar.com/_UploadFile/Images/file/ziwokevapoboj.pdfIn PDF document text
    • http://dichvuhappyhouse.com/upload/files/vagakudalefupuva.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/ramelix.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/309a9f89654cb67890a0824a19429bf7/6323201190.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/75592530272.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/83e65fad94ba421bb1eef93654b672f8/kezupapaxetuwowufa.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pimusixizofuxo.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tezonirituxetadilos.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/sesefusibovokukid.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/67129241176.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/83673875394.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/vinikesafo.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/24176343165.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/92596500952.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/soselefumu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gufusuken.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4e749e2038c54682e1a64d9cbd7d2ef3/62874583210.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/66185730182.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/17404747087.pdfIn PDF document text
    • http://chromavials.com/d/files/bonej.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/dikanidoxezuritigunazurur.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/vukivusimuwu.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/49812507022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=anthony+joshua+watch+onlinePDF link annotation
    • 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_off0000b318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB318 15564 bytes
SHA-256: 4f47f95b2b4cef5e7543df9066ac16b3c48e9a365618f8f738071cb7b201dc47
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 10636 bytes
SHA-256: 98c1f832a38d4aea8b04cc0552103a813f46b0a04dcedb7c04e7e8bf4d4a13a1
font_02_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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