Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be008c95fc856db…

MALICIOUS

PDF

85.5 KB Created: 2021-05-12 04:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c1c739f49999d37007296868ea8691 SHA-1: 8e4ba09d519f47a105a4c1c3e8229b3f6a1d90ac SHA-256: 5be008c95fc856dbd5463c3f82e93978250a64987b22ba5007ce349216819bad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains strings related to 'landing page design free', which is likely a pretext to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=landing+page+design+free
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/4j13u4jhu0qm02p8mj5n452pml/96152108299.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7f0v6rlqmgc3q24piu5l9aj1md/95424649300.pdf
    • http://pphu-joanna.pl/fckpliki/file/60707131203.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54a51cf8c---81624599748.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094330c7d043---vujotusiwanomivubunidaz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcd49e360---10763557172.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6a17716db426e63fc88b23d339609220/93222894119.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa2795603---bujepufexabox.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a008b237a9---9817749928.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8758f456---zigipikaferike.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4ccaf4a7---32960766256.pdf
    • http://proxima-design.cz/files/file/sawaxiletomipiletikopug.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1f73na7nkhhc2i02cdctea410f/mivitufobolekarexekojaluj.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_off00011218.bin
1378c12f74ede9df7a682a3e4e0c855f9ecefc242f9e8b577113be117e9eee50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 5116 bytes
font_01_sfnt_off00012399.bin
9dbb88a9c6097f30f89403a3c88c2999221787e85a056fd61b7f8e672f15b60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 11076 bytes

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