Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08cdf778a435c90…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 15:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8628365a69a9032a08d965635c3d3d2f SHA-1: b53314bf720c7408cb33d4f5c868e1eee211cd97 SHA-256: f08cdf778a435c90d1f2875c0bb943fd0d49309c9b243e0e970d88237b0f944f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://caerulumpharma.com/upload/files/wirozorerogojurodusiba.pdf In PDF document text
    • https://securityguardsupply.org/php/uploads/file/fozakabi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f636d6cab---jivedewotexawarak.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/sovusatibomabekanidaw.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e60d02986ae---kajupavavapalalum.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/pubivebosokajelife.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lulakad.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7539969787---vosusasuxivuvebikimoxi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e01a60e1---tiwumejivaweta.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/sarunemawapa.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/6975840866.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/43204912784.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/62941367217.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/18578286747.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/75910903401.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/6667576928.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077a866a7825---wulemalawapebekeguz.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/litaf.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7561a78d---15403424779.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e12ae38ad---vivifudinenilipes.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/petovekofanizijunuda.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7795f62c---pesunagexifazo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/1825708627.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jexezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cleopatra+chords+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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 17904 bytes
SHA-256: e1834e50f991a46058d5381389b00701856d57d1fb6134956de279fe17cc33b5
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 10552 bytes
SHA-256: eaa5f57396a7e801ad9d9d63a920f528bfa7237312b11ba06f8f9d28510f3fb7
font_02_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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