Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e5195d84dfc3b2…

MALICIOUS

PDF

92.3 KB Created: 2021-08-10 05:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 928cf53d7472fe287120e002d8520f16 SHA-1: 1c2ca1578355a65c1bf1fb3dce5cf2ffcf9c4df4 SHA-256: 33e5195d84dfc3b2c5ef3cedcc694985a61da5059a5a15e3b863b202abfa76ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised websites, designed to appear as legitimate downloads. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://geneolock.com/ckfinder/userfiles/files/87952419196.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511164931179307.pdfIn PDF document text
    • https://mszukam.pl/dat//file/21376770062.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zowowexeke.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/003d2b1840646aacf63e2e4286192eb8/99534478889.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4ddb400f---19545316965.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i3qlh8ua2fh7g3be7limi7etb2/xalujapok.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/14313050015.pdfIn PDF document text
    • http://bdcomunicazione.it/file/33547471533.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/pakopuw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c6b889dc---47231976473.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/54841007874.pdfIn PDF document text
    • https://akvaguru.hu/user/file/4812632178.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/tuxivakediriduduluxom.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078360fd63a9---6714039118.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/3964947143.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be361a15b94---18007490160.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/uoo6038ukinovbm8g71ccnbq52/tizox.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/64386074058.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/xefemusam.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gopawufa.pdfIn PDF document text
    • https://majubesar.info/contents//files/rurijezuronanipisopupo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/ponolixaribefu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae1d57b4a1---zuwusigonuluzap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=boot+camp+assistant+unable+to+download+windows+support+softwarePDF 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_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 11160 bytes
SHA-256: e06b42c9a5176792c79593fb237ba997540d4f862aa39a9bc5ff879c058adc37
font_02_sfnt_off000132fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FC 17196 bytes
SHA-256: 72c18cd06dd9d96f9e6894a050ef4cd70cbc18fc7d7874fdab71ce8cd255cc59