Malicious PDF — malware analysis report

Static analysis result for SHA-256 704628d35c87332f…

MALICIOUS

PDF

83.2 KB Created: 2021-08-23 18:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0a176f6cbb3a378914b03637dedf84d6 SHA-1: 9e743513b23927ab7ab898fa228224e07ebb6948 SHA-256: 704628d35c87332fa71afc6db1ee0b5dc3c26fbb0af69016ddc6afbb92ccbbef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+gain+more+strength+in+arms PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b057bf2db1d---zaxafalomemiwuwulitov.pdfIn PDF document text
    • http://xtra360.net/campannas/file/6742289845.pdfIn PDF document text
    • http://indel.sk/userfiles/file/mijolomep.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/gufapipovof.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/532ee37ccba8567bfade75b5f5690e8d/sonaket.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cacfb4f570---32528799588.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/67931769126.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/95827106723.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/69212956366.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6f4e204db4c2751fba7e41153a88db22/remijapope.pdfIn PDF document text
    • http://signauction.net/userfiles/file/wefavoko.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/47c80481005c7d806364fc0418aad630/guwaziremonikisidekumozi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/zugipelarelefive.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/lifuvezilitawozivepejego.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/semajugefitodedepivu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d5d71f258c35c8a95e81707a1984234e/zikinoxirugozozebik.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/82988043190.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/nobabum.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/tokisuguwupovawopopetef.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/tovagidi.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/zojadufatimumiwotigojez.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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10584 bytes
SHA-256: 64af6c2aab528006c58ff9ee354506e425b6673b10c0876d8d541faf3ec4cbb8
font_02_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 17444 bytes
SHA-256: 3d38a4a2d47a8b8871072d03f175f335ad4b64951df02f79dc31ccaac05fc179

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