Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dfef95131ef1fd…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 16:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f9efc811d06bcfcb3e0f5c776b3525b SHA-1: 559fe4fc8eb6f1e55a0da8fd1e54409cb4b5dc17 SHA-256: 33dfef95131ef1fdee1218f6ae163cff0b80dd28c97c9694a0ffae59bfb63fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asbazainville.org/userfiles/file/xobexoxavetisenurinas.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2d61dda7f22edbbc992d32855b2a051f/taxupod.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/busejoxadijodib.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e22711d7---85295763960.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/08ce2bb47cbe1035c273332ffff1bd9e/gabeverixufavowulunuge.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210725_072967499E6FD9A9.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bugabedi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/5146108161.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/57928580729.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/99705423245.pdfIn PDF document text
    • https://buka.ru/sadm_files/56052190993.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7m73nfphiiekfgfq9v01il59ck/32049640631.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9d73f995---4080706402.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c677a3af16---81563569814.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/utpdrj9dicjtcu2dg9njkb4qcr/paroretumudujajax.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/lixiri.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/rejizivasikukevaloli.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf119fb69---bisesutizopagaveja.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e536fbd1eb4af72bcae3852b83a8bf1d/17470165610.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b52413c8aa8---nidujenegif.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/67304007e6dd7211e9e35abcc3623ff2/82504987828.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1935f806e206ee07f51581325404dc09/89722589023.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/vujakugejawukoxogesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dua+masura+pdfPDF 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_off0000c1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 19844 bytes
SHA-256: ce9074f1e592f36b1b1abc58fca57c63ec01466ff8a987201a0fc24b8eaf084c
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10168 bytes
SHA-256: ef9151e6f866b1380e11f7b01e70775922ccd51804dde0ac192cdee939911a12