Malicious PDF — malware analysis report

Static analysis result for SHA-256 7897a8b5ffb53618…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 09:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a517a7467c94dc7202aba784e19ebe19 SHA-1: 3026b5817ead762ef0135be927657ba78d748f00 SHA-256: 7897a8b5ffb53618dd6f415b90779aff79d33cb95e5afdbff3fece4666d3dc82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://casartigianiudine.busletter.it/ckfinder/userfiles/files/bitopagodojezamovik.pdf In PDF document text
    • http://pension-erlkoenig.de/img/editor/file/18840333824.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f341292601---soxuxugebe.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/3941968966.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56105942369.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/58009929322.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/pumelukekavanonagijuwodim.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613863ad2d5f2---1296951265.pdfIn PDF document text
    • https://aedwea.com/upload/foto/mobigikagurikegagazoruba.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/novolumadesulapatusetuti.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/87309470484.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/sutipewojomafi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1e0747d3ec197305013c229cb288f73/dinukijafolo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429279b08b---puvijirowemo.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/gilul.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/budilolupuwu.pdfIn PDF document text
    • http://ned.ru/uploads/files/6100707552.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/tukojugasuxonusesemig.pdfIn PDF document text
    • http://wsm.hk/images/files/96541514563.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/wivoraruribewelopow.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/sugelarul.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161403f747e49a---17971510123.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/mewusudupoxojo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/natew.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37c348b5a---siwimisuwigafipozejimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ometv+download+laptopPDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10372 bytes
SHA-256: f7f93154f553cd1ce901a054af1e3c0df3103e0e1bfd46c1da6fc878de01ec4a
font_02_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 17512 bytes
SHA-256: 0f8d5953bc7615e92308c7e351335833386571452bf29214510d758b4f83f815