Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a106c73c872acd…

MALICIOUS

PDF

103.8 KB Created: 2021-06-28 14:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b69fe4f175ed8aaa79b17fd44c03273 SHA-1: e0e861f04bfcd9b6085579742df6cd41a05dd056 SHA-256: 00a106c73c872acde9b0b285782de21aae4bcd64d6987e6f45264e87156b03c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites that host further malicious PDF files, suggesting a multi-stage attack. The presence of multiple distinct hosts and the use of disposable hosting reinforce the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7iebpbs8iqc4hde075vg3npu3a/ribofulagixavitujogufafin.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e75c50b88---10320643539.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a6fb0a98---41148100545.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/042caf2465ad477dc4c06f9c521ab96f/22323938301.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4026b9309---73144076649.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b1e91b21---bipudafatexujibogig.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mvnlsoe4d5otgrut7ccdretj57/mabizokeredotadunupok.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfb3829e6---gaviwozudizobuxokorukali.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab676605b93---sebepedakop.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fafa9aa849---44094922652.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/jiferugepijorik.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f676dc6b0---88866415133.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cvre2g54ekn1v6mo1qu734f5l1/mivolelonotesujurob.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9r7ok869o8n33vih33hf88k4ph/foxinututesozenekaruvut.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gokojowutibebobubux.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/52466261359.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rmhcrouo10le87oocai0ohc8h4/88929319928.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/46068947994.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bc56120c1e884b37908294356bbda6b1/wadoridepikisofimofexu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35128fff3---11991198673.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607650824d59d---zigiwidibuk.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2da800456---fizufitobasujijip.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e34dd1f3650c21d5e04f284434ecb258/52994742829.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e18c58c4c3---binuputejeduparodif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=calcified+pineal+gland+fluoridePDF 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_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 18144 bytes
SHA-256: 7fa8709cf77e7145cf7cf69d57b097dce41a39ad8c5919ffa099bd83a0c648e5
font_01_sfnt_off00016286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16286 10660 bytes
SHA-256: 53235f56ba7465ff73c8f1c54411cefccfb3da0dd23430cc493ed424a75bbd42
font_02_sfnt_off00017ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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