Malicious PDF — malware analysis report

Static analysis result for SHA-256 01513a69136cb90d…

MALICIOUS

PDF

68.4 KB Created: 2021-06-08 08:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c67c4c64639929ff67cfbe06940be0 SHA-1: 13e7040e179c9441df661b4cda81498afd55678b SHA-256: 01513a69136cb90d58eaf6571e67aafe6c3c6e35689c02821911ae864c7ec174
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=bee+gees+too+much+heaven+paroles+traduction
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4403890a2a---tefupegerexupoguwux.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5b09c1234c85f0ea151a9f54e23fe215/23345215517.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b294af9a97e---xuvidatisuzizefalodenumok.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdf
    • https://beautyyaurient.com/editor_upload/file/40547665036.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/49209302591.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd243c6b8b---gizovafatapa.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc8fa4f78---nigevinafakituvazudepu.pdf
    • http://thuexedanang247.com/uploads/image/files/vasuvawifabesudasenegejew.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1adb644c8c---rotedanal.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3prlls1gjun7hcjci4552pjga3/12506791797.pdf
    • https://cambodiadriverservice.com/userfiles/file/gevodi.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8bd28717bf40d44842840fb7b3d7ce33/pokozokipumigudanekaleku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceac.bin
a3eb86b79a6faca0193f7bad09233f6d6088888a4c2c03979ab0c1509f01f671		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 5596 bytes
font_01_sfnt_off0000e199.bin
6451dfd79a9ae79b41f5cb2f9765138c6c92ea9f8e2bb75a577c38a616896d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 10524 bytes

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