Malicious PDF — malware analysis report

Static analysis result for SHA-256 847a99cf25c422c0…

MALICIOUS

PDF

84.8 KB Created: 2021-08-11 15:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f54df798b6775eee306dea8f60a39051 SHA-1: 94c96357955935f143b034282d687a6f40757167 SHA-256: 847a99cf25c422c0c836c981ec4e978570fff5e09a742e3dc96367751544f014
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content, potentially for SEO manipulation or to deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=how+to+start+slot+machine+business PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/p7qf5eq7kk49fg2b9g620u4seu/punozesebolinadisoru.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/64953340415.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/2367080926.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/766a044e21ec2b1dd6dd7e50327b3dae/84427456769.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/48374879975.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/miketutafosukijedixe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/58c2b8b924559b724b65cbf4c19b766f/potine.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e19be156d---22420083456.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/fuledibinefe.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/rirabif.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/vosazozixijolaxopojiwibu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sulixakamugaturelumomopi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/8222683603.pdfIn PDF document text
    • https://dacola.com/upload/files/xawagovavosoloxukeno.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fbc292883---xafavodefowijovesasanamu.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lapexured.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tidulomizemofuxupuwu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f7fb7bc5b78f02dc6c033fdf521bc0ea/perilej.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bavitovovajusila.pdfIn PDF document text
    • https://teddybestore.it/file/gipumokozavavitok.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce57239cd3---43778729052.pdfIn PDF document text
    • 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 10812 bytes
SHA-256: d5b34691d3827f9f9bf5e3c48ab33036694b9bacd88114a54eb9ff03cf3c5cf3
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16264 bytes
SHA-256: 53f4e33197e0cc78e349e3b617068ab02ae9f568d7703785d02b5b8fc11c8336