Malicious PDF — malware analysis report

Static analysis result for SHA-256 952d3d5edc2fd92a…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 11:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7457647252e0ee6eec5db63f8f77f72 SHA-1: 04587d9b3342afe331ad9ba228bd79ede117e760 SHA-256: 952d3d5edc2fd92afda390cacdeb84d6ced34d9fe4d90c90c41ab5b9fa84001f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics suggests a deliberate effort to obscure the final destination and increase the attack surface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tcihk.com/userfiles/rifepifu.pdf In PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/60514178451.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/46216533234.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed5a25f276---21288040276.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/75bbe7648b752be41d4d4af494116674/87446314951.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/zawodevuxoze.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49776697371.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5hpnsao0mv3d1l3cp4j1qvkv9i/17889951563.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/28823558984.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/91195400388.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109042207559157.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/nesuzijowudolefewodabomej.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/86024768136.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35198429390.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/12492113576.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/80836222752.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/akt3uq2cqicrbmme8b34kg2896/29057850465.pdfIn PDF document text
    • http://lscapital.it/images/file/vilabosaluzigikaw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3mo8jgclrimfkgkfosbo8350ki/72950865323.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/82938674412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=la+noire+apk+obbPDF 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_off0000ab03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB03 10124 bytes
SHA-256: 8e466049408a5e203eddd74f9a5af0212e4997a745545687d9da3ab1ece9109d
font_01_sfnt_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 15388 bytes
SHA-256: 9291c0fb52d582d0eed9892c8a07503ad7d3a011297a7ba5fbd59b80e679033f
font_02_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1