Malicious PDF — malware analysis report

Static analysis result for SHA-256 595c5967b9c6fdc5…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 09:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c01d1b85df01b4d82fb904dc01b3426f SHA-1: 35f2aed8fa0857adcd754fb8ac8eb9c33e2c6906 SHA-256: 595c5967b9c6fdc556dcc2f9695bfd66c5aed04dee9ccd522886d6a43377a827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=on+fear+krishnamurti+pdf+download PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330038bba55---xirezuv.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jedopokilorekipawuwax.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907122133.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/turatarodirajikonomi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f729fcaafa---88979436875.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/9650746019.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • https://luminex.pl/upload/file/javoniboren.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lotidozegi.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/lixujupipew.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/pidimemevezabinezigo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jhvunhqjnc4890v56sr5sfkn94/tabilemipulatexutamo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/94191436683.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/bowekajasodotifokesegi.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/32754228413.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gujakikizimofujigijesinow.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gakopuxaxurezidijoke.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/86366598775.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/81210321111.pdfIn PDF document text
    • https://emprenderem.cl/files/pemediruguzoze.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/sivudonibel.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wovukodevoxa.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/nubolakaja.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/divekavemen.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_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11068 bytes
SHA-256: 4ffbb2d9a5742e019c5ac8fe8bb0fa30d4e3be89875f3e118aeeba3d0c5351b1
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 19064 bytes
SHA-256: 950fec6dbef7aa62ac9d15a463ae496e2500ccbc814dd94e490e2ae33fb1069b
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1