Malicious PDF — malware analysis report

Static analysis result for SHA-256 67102322ef1797d5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 09:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89da3f109015cca9c4acf2309f888d4f SHA-1: 8eed7ad0b85ee7a997ec6541e03da5327268e63d SHA-256: 67102322ef1797d5193bf08113781c18d95fd27fb27dca7034070e2575840928
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=kernel+discriminant+analysis+pdf PDF link annotation
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a134cc74df---tevosozup.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/92629820489.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2baedb4d1ff7032a08180cb0c659e24f/56869944726.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/11227216149.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dulenifapisenijetusefofiz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2406f50e---wunosavevi.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/84085381105.pdfIn PDF document text
    • http://abpaluso.com/upload/file/81662835005.pdfIn PDF document text
    • http://qwerty.pl/_data/file/saxenoriragodimik.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d663008d---88614503750.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58861876872.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e0814602e---50768681089.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pametesu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lasuvamekeduzisejoluse.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1e074d3012885a4906c6da27bd38455/57855916930.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/64076435488.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/semevg8ptcib3v02klmi8rpdbi/desuzeboserefefiraf.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/45164812979.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/71b51521616dbd85541fb9349f053fcf/64323194569.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210607035116.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e065f1504---nixobanoj.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/57349023683.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10764 bytes
SHA-256: b260aece411d23df3790850eab2d37173a9e1f7a58bc1241e9a4b1a6396c622d
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 18236 bytes
SHA-256: 52b8a4a83d55339a9d78bcab5ee980af6c88fb6283426e435d63fe866133759d

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