Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10c1b87760c9d64…

MALICIOUS

PDF

79.4 KB Created: 2021-10-20 17:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0c956ffccdada191e8f2e205a4f5bfc SHA-1: 25e608c1920cca6307dbe05b5a23b07857a25174 SHA-256: a10c1b87760c9d64078958162834d83fb4062ba3bf4a137a508df2c67693c5d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rosebankprimary.co.za/inc/ckfinder/userfiles/files/26778479213.pdf In PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021101811094673499.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41242493935.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164e721af6af---didetokakekizowasaburomos.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912112654.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/07/9276777653.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/27977489645.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/5065177472.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/libinatemegovo.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/xuzuzonezaremosimipar.pdfIn PDF document text
    • https://o-dance.dacola.com/upload/files/rupalimalifipifefo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/64081731814.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/20780603180.pdfIn PDF document text
    • https://topupdana.com/contents/files/lusobilu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ac8f183c0d---mugibuwimilobesazowil.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/4585852604.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/2776864275.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/japogosid.pdfIn PDF document text
    • https://motoralbini.it/files/file/supedawudiganaperomexa.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/56980572725.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sfd0bfer29ajbp54u80juu6v15/35368668387.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/fasozipoleledawexiwajil.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/74886560653.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/90497353274.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/u-9XGpgKpwY/uplcv?utm_term=anaesthetist+and+anaesthesiologistPDF 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_off0000d400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD400 17344 bytes
SHA-256: 3ce44b500f2036ab02166ad4b8dea68dc4f29cf2560ee420ad2674a4579bd9ab
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 10408 bytes
SHA-256: d5f5cbed413fd84e6e27626e9febc118b8b32b4ad08b1493ccc3a3ff57d63d7e
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1