Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c39f26c3933b30…

MALICIOUS

PDF

163.1 KB Created: 2021-07-04 15:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 33808a7b69de066f94fde6cf5e995094 SHA-1: 38adc51d89de288924afee631d0b26861e0de2d9 SHA-256: 23c39f26c3933b3074f2d1630810fd8dd03efc0b3122802b03cae94905581675
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content, suggesting it's used for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports its role as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9674

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://archism.ru/uplcv?utm_term=borscht+recipe+with+dill PDF link annotation
    • https://remoteyourstaff.com/calisma2/files/uploads/77124211085.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/11593799249.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ec096160---87375958132.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/eef233dc55e86a4547b20b1661c2b031/29684929622.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/5dfcc808d4f93ddeba562e0320c5a547/21122909290.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/69675867751.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/73335561396.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/lerujuxowaludenijaniriro.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38935049076.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/060cc1dc0c53bdb293fa4bb50c4cf84f/61940965236.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/10361095512.pdfIn PDF document text
    • https://codecs.ro/images/file/zikikidimabaw.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/52c6b0e0a5725db25ceaebb2e867bd69/wegenuwamozojuwe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937793d0287---tasofefoxikedapedofirek.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/8b2dc4e71d1bdf1b685a152065cf49c1/76259187875.pdfIn PDF document text
    • http://usa-ex.com/89657861618.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ed82bc917faabc5e9f1559241b76233b/tebif.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/venonunejulofuxuluximow.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a81da4dcfe0---8367911199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56e24b79c---goxeziporunodifeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967333e44dc---femiridugikejigi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6d32cc1e7f1e351d3633539f34c8132c/vozegopexubefezu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1CC 29920 bytes
SHA-256: 87864450432fe7092585d06b068ba87eb211c3422546ef9bea94c29c4a7cf2a1
font_01_sfnt_off0002273f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2273F 10484 bytes
SHA-256: e63b2b815b54df736c4070bad2917db6d1e610b54526c0b726b8c8153832414a
font_02_sfnt_off00023f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F45 3072 bytes
SHA-256: d03ab71a54a1f2994f99c1992cd7596d55e05b95c14991033e9ada8514f76f7c
font_03_sfnt_off00024b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B91 17004 bytes
SHA-256: ea84a5b0167e557f456b52d7e81ea0aa7fdda26df82d970783f5f44da15d65cd
font_04_sfnt_off00026453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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