Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f00a92e5212792…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 17:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c0263711513561ca5a718176715dcce SHA-1: 4cf79350f9eb61415bdf4e931e4808c66fde0456 SHA-256: 96f00a92e521279274be06f26b47c4e8833af430d3ba5b0bfb0fac7f9101bed6
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://eric-parnes.shortex.com/ckfinder/userfiles/files/gojut.pdf In PDF document text
    • https://maturana.cl/upload/file/7165343972.pdfIn PDF document text
    • https://petek.biz/resimler/files/32674367702.pdfIn PDF document text
    • https://onlinendttraining.com/files/mexejezinisuro.pdfIn PDF document text
    • https://ienter.bg/files/nigisofuluragobare.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902155159.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f89408a062---megesinixukam.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/wutarekivigujogikekofikiv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vowolirisikezukexoxel.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395cb4a467a---zuxowugob.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/tixuwuwuwufumuderelunel.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/18066227430.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/rolizodebalu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/10459303663.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910031453.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d47fda016---woxemunopinavi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9e6cbeda---paxuramodakos.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/zopag.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/kuwepamu.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/10962851787.pdfIn PDF document text
    • http://candientushinko.com/images/file/fonowupifewerolikete.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vilawawewiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diaphragm+anatomy+diagramPDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10608 bytes
SHA-256: f8b5cd377822f1d620d1b1eb8e0dd2a6eb16e8707d2f5d5dc3d08d95b57b84ed
font_02_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 16716 bytes
SHA-256: 7efab38138715fde06763826fc934147d08374bfd3bce9949dca8d0119bfac71