Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c7fa18c7a6dea…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 11:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4aae3429affe1a594a0b60d9c13347b SHA-1: 3e6881c69b2f95e0169cb80071a2d567223db1ac SHA-256: 995c7fa18c7a6dea9d3e85e944aa4774947e16ea5125f9a225579ad48138873b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of further payloads via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=free+guy+stream+movie PDF link annotation
    • https://seedomoretravel.com/files/files/53959780782.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/sarataralejiko.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/74397377465.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/kititisitonipam.pdfIn PDF document text
    • http://mfcpavpos.ru/file/kologoro.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/23676064304.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/sawuponejegora.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a5e84f09e5804ded5dc75722741cb1d2/21803843440.pdfIn PDF document text
    • http://workontext.ru/media/file/27987846808.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b0a7f4b6---61226833904.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/12548032270.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/27158508747.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/24626063001.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/61084082056.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/43866404136.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/karinemokuvesixiwaruj.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/18564145429.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/67392007979.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/kobavozopebafute.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/72145718639.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/66524665615.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/18257743276.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210911213632_1788033621.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/62726710196.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aeae154ff---64978199728.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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 18544 bytes
SHA-256: 208f2fc50267cf342f2dcadd028455549f9244b9501f81de48ddc2d8b2b3cdb1
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 10556 bytes
SHA-256: b2800eae0ab2e9aacfcfe184fd6a97ab3e30a6d28adc393dbcfbd8a63febae54
font_02_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1