Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a47df501333fd33…

MALICIOUS

PDF

81.4 KB Created: 2021-08-10 07:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59947139bb316b1eb28db4015552e224 SHA-1: 726c76d00e4f4829898a91e2ace5daf9b4fbff30 SHA-256: 9a47df501333fd331c31782ce6c4c356b1d1bf004a699a9329e5326d24efdb40
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute further malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress sites for hosting, likely to host the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8348ce8ae844f234da06ee816566dc21/dotujuxo.pdf In PDF document text
    • http://ventilatoryzlin.cz/images/file/86525052985.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/87541438176.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/80204449563.pdfIn PDF document text
    • https://haidangpc.com/contents/files/55435122533.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f50436bcbfbca1ce3f63d249795ece45/jewukipavajetudone.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07c647d3f---samifokenujatuje.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8d2b4c8a---94964657144.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd7b579f88---44723865064.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a09b36263f12d31cbde1ae22c07617b/19740769663.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/tumamapek.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8471a65e1a---81240285666.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/rakezadojagiwi.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/16161668945.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/fofuxufega.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b307e805---zivusono.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/30885566619.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/jerafop.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c01381be5---winetananorodawaji.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/48449945943.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6a7b996f---jifasivoxotexefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kawaiistacie+slice+of+life+modPDF 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10508 bytes
SHA-256: be9705361b64efc5d57b171a71fafece79a0fa1e91e62bba521919c147db97b8
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17128 bytes
SHA-256: a7edc1b700b101f775109d779671eb0fa9e585d4c0b180b6139f25d11c010974
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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