Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c1f13d0339e626…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 11:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62165c7038ecb957f832b5b2cf2b43f3 SHA-1: 0975d9e2223e7331b87d368825d184842e8dd1f8 SHA-256: 79c1f13d0339e626b5c5283faa7232fab89d2d3e64fc4afc2613fabf6e2232e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137baf8c898e---41423329894.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ec35b539---simovilopojupiva.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/53644396753.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/degar.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/junivogaguzogigogurulipek.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6915962111.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5d1b15df---lajujejejewotunub.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bfe3efb58---108675670.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xizaf.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/31830827042.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/46361911997.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/jutagelafixoza.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/xelasolig.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/53011953269.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/69009110897.pdfIn PDF document text
    • http://stefani.cz/fck/file/patibexubuvewozofokikib.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/nevasenavivobaginido.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/47405441597.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c199176---patejalezaseworifenol.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/6730517843.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/segunulewumewuxawaga.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/vokukudenajo.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/kitikopujodima.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pojesuxiteruf.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/62905914135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+hack+virtual+downloadPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17476 bytes
SHA-256: 0e07bffcc582070c6d2b29e890f0a80ab92f28d53b047b3f4f5ff4dea21b373b
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 10832 bytes
SHA-256: 74851048259b2b5d72a7ad99e006e9fb53e3944a7cc6a9c0eed2d630beb4079d

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