Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd607ef63db4f136…

MALICIOUS

PDF

92.8 KB Created: 2021-06-24 00:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27cb3b49ebee697817e0fe512003113c SHA-1: d5665ac6e46651ee08c6c3a74e57308d7887d355 SHA-256: fd607ef63db4f1362f399db61fc7548eacec7dfe67529a6063b8ef173349415e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://infrive.ru/uplcv?utm_term=hopeless+land+fight+for+survival+mod PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8eb28d875a1abef3f4bde4b6816fa35d/gedatetibopugufedikebavag.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/53197373ad0beaba13b5369ea33f7a9d/76350482988.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1011617c---40425904259.pdfIn PDF document text
    • https://agatanorek.com/files/file/kuboremuvu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09740b0095fa4d5de567c324fc49b032/66680333992.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcdda0b23---sotorigobivirip.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/39191817530.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8da55352---87902981495.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/37781349254.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lefiketabademulap.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/dosejuvexe.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/26969360428.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/265a1f76663127e4226ab6fe8c1dfb07/sazoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013e08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E08 21620 bytes
SHA-256: b669d7a4e26d240e78efaa5cf6298376d82726f63b20ea55404c8c9fb6eb2fbf
font_00_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 2904 bytes
SHA-256: 8ce87a32d580a036b18fd815f4463fb131c38f4ed00d846aeb2d144ac6af8bab
font_01_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5476 bytes
SHA-256: c9b46417a86552972a15f9eaaa25189c112e89c02d8cf2e749194a1ffe818c9e
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 11512 bytes
SHA-256: 0924bfa8d665e569bdf96cb3bf829356e08dc66c760777906b6620e82c153e74