Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd255ea47dade10f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 13:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d4a7485afafe3659d71e122cd122627 SHA-1: 4b1d1fb3b5a038e202eef26240b050d6a05000a3 SHA-256: dd255ea47dade10f180aabcf9572769e7a411b42357c4ffb976dec2d10968b32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate that the PDF links to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a62e1a1c0fa---xexevuroxirojidamili.pdf In PDF document text
    • https://home-consult.lu/userfiles/files/fofolov.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6a86e6f07866cce5e7c4b60cdfac352b/pivovalodof.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/mepudi.pdfIn PDF document text
    • https://morabia.fi/images/file/didelijafujarilelapos.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b14e2634---55861690658.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/27689278493.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506041706.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/tomenatuzamavo.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/25551200017.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/novoser.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/lekexemopifijixo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/482b30cf5a1764b1ef450d8ec62fcc1b/17549315825.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/9934389622.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vederilakuwafizojepi.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/24526857202.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ek4cjvdh12ht9442o11nu3kdkn/kigaxi.pdfIn PDF document text
    • http://rcot.by/pics/files/29248083820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=reloved+magazine+pdfPDF 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_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 16896 bytes
SHA-256: 024c5ee1004b45798f3737d67c51c4977b2bee7029d516d0861249cd3632b0b6
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10648 bytes
SHA-256: 7fa231edd72e1bdc842120d590f28549b68698bf23ac757840bc60458f7e0d96