Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f0517302e57234…

MALICIOUS

PDF

85.8 KB Created: 2021-07-25 00:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f44548f57fca71d16188c27530b1f1a7 SHA-1: 01453db413748f719f1efc6f7a76cac60993da7e SHA-256: a0f0517302e572348663dc7ed438982cbf1fbc17235b042d2864b804d4b2fb53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wolfgang-photography.com/userfiles/files/rovugujumiditovumatofumat.pdf In PDF document text
    • https://equator-maritime.com/userfiles/file/25872449491.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/bevopemozepuxad.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/81908168212.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a83658da3---12785281840.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/wavikeputeto.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3fdf7ef8c00bb3c3438ffd220c86b1de/ropotejoxifogaxuguvixonax.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/fetavesabiteset.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/katepoz.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/42978146292.pdfIn PDF document text
    • http://aps-mes.com/files/file/dovuridon.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gebasebukitawekerumivetev.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/58d5vmk4r7tg2g37msubitpfsp/mofemavamapolisiva.pdfIn PDF document text
    • http://imi.vc/upload/files/javokepubunuxedamagiwixo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a946ffe63ad---betanekej.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kasujiripibatopezugurezi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3851a9dce---89657562566.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/bovimagopenazenixowe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076d84a6be52---23901854115.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/t4j2c4jm53tj49uj2shi65p5q9/72301338209.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rizupodeboxetuguzeroj.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/jifajesitidaruregemurajod.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/p3rdualqidrsu93jm2eir24uf1/dapofinebunozofe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0666a726---73932137780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+a+formal+declarationPDF 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_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 10548 bytes
SHA-256: f71ef86af0feac8a4e66b98b49de93083bdf62e0b00b833c5e108ed3a45d2de1
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16960 bytes
SHA-256: fccafe748ecd6f0182c49261e2c8653e5722a9c64fc02e1a231be80e22b5a54e