Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aec8823ad1b909…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 13:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0ef85c3aa98d1287569e8af17a87af6 SHA-1: 2f431e8effdc74fc71e8f2d0d9e30ffb2d0f2773 SHA-256: 74aec8823ad1b909e3bcf62d14307905ccad5d527422a8d33666bbcdd94b545f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot-based attack. It contains numerous links pointing to compromised websites, including a WordPress upload directory, which likely host further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a phishing site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://baldonimarcostudio.eu/userfiles/files/67328794725.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c3eeaa37da3d356501680fc70d92f725/49165177052.pdfIn PDF document text
    • https://777mto.org/contents/files/48095937652.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/49418522926.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/watot.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/rusegodoxesusedalifutu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22527690965.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/sobifozijajukexob.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/54735866924.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/53581675521.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/38806987829.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614db38ec69a9---xatepesero.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/35145310606.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/15768994826.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/64942280974.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091000554073499.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/98d01a88a899f0a6fc8a6394f555b0bc/65146386002.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/wevuxonipajon.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/82254834139.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7c30faf1---62910382552.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/filik.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/doxafagetabazagimerujal.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/tedudafamegunuzajoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+the+wonder+years+online+freePDF 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_off0000aed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 10768 bytes
SHA-256: 520104259ec751b7e1ea304600a91bf0dce72cefdf3f104e53867d7501e74567
font_02_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 14392 bytes
SHA-256: 426d43be745d09e747462f6abbd80421990f501d70d2f407849aa791a1ccc841