Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c9d9e0270fc1d3…

MALICIOUS

PDF

81.5 KB Created: 2021-08-29 21:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8f245839f9cf09015d36c4ff8ea1fa3 SHA-1: 8b2dfa55792fe93431c80a1534514f3c498d284b SHA-256: 26c9d9e0270fc1d385c41d4bd23138953d50caba978025db174e6b7ac49ff78c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the download or execution of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=leather+business+plan+pdf PDF link annotation
    • http://miyagi.chi-kara.net/Upload/files/winuzasodu.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/51625125705.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d8087a0a---sukarivamoberufetomusines.pdfIn PDF document text
    • https://digireg.li/upload/11205800252.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad237fa98---88504969006.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db6c68e9f---87011283038.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/21388069639.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/xifiwebamoluxitipag.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/83877340478.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f7eed6693e5be91578c124dd57d069fd/sutovigukujibeje.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675be25ee2---rekofalaforelufopod.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/sowetajajukanonomisotide.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/muvifavilinuvaxaxemusa.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0febabce1aabc7c05eb728311350cff5/24569974253.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/bb91b703930fd35a7cbf1f125344a95d/51754747784.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3db5a05641---18255990963.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161165cefc5260---38407165099.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5op5gpp90kdpia3hvn7k7lobuf/86441035957.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/90af65ef9cfe8ab1adc44ab0fb7eec26/6020197521.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/38873069291.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92993283080.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/goguvuxapotevajupe.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/lizopixiluwigeze.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/530818958.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16860 bytes
SHA-256: 6a2433b5a3f57ac2e63d94841d7c47a4a66ec0f878b2a19c7e03364ac7f577b7
font_01_sfnt_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 10672 bytes
SHA-256: 41785137dfdf4ba0e74d577a5bf01bc8b36f6ae97da12a994b24f77a6ab10873

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