Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7fae491b612d09…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 12:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2aefbffb0d8f375fe40fbd53732d511a SHA-1: 05b057306d5eab58dc6e3f45be674ead9122b08c SHA-256: 3d7fae491b612d09818bb8ba1c3529f74e201690137dabf8dfd01117f1bdedb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=top+android+texting+apps PDF link annotation
    • https://rails-bg.com/fckeditorfiles/file/41637459533.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/48987383308.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a296d39b---93297055251.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rofidapudusa.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lirisowafuwodegusaxuwuke.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b292eb4fa---59527602198.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/gukivoj.pdfIn PDF document text
    • http://gtshotel.it/images/file/bibaluji.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/satasuzunamu.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mulikizokased.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/26780830760.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/diwigomodesed.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/xijitutulidafa.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/75403876032.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bigarakuwikabolaw.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/jakof.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dowapokutijijipuma.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd13a3dca9---vewoxibabekum.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/zatudutit.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4968efefa---7831616829.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/84894198120.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/52967703425.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/jevejufixosetizenuxizulo.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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 17952 bytes
SHA-256: a584806eb5fba9d54262b1f522af811282c1594385110c5b35e5e0569dc47b51
font_01_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 10584 bytes
SHA-256: ec4f459a348b1fd9757da055f44f871d0b4f6930215847e21bd1ad8d506a4a4a