Malicious PDF — malware analysis report

Static analysis result for SHA-256 40746cf93d3b7bc2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 23:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c2c289f7d9a6d9c09cad373cc666ca5 SHA-1: 2a74c4ff9705c7066ab522b9351b5e942adde150 SHA-256: 40746cf93d3b7bc2bcba2a5c1e5b48bbcfae3a49469663c028fdb88b6960cd6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=statistical+physics+solved+problems+pdf PDF link annotation
    • https://maintogelonline2.com/contents//files/takelerelogelewevudaka.pdfIn PDF document text
    • http://tulga.ru/editor/files/92986101319.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11b3574e---moxudasowavudilogem.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/16530710367.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/fizonisovagobaxilozanaru.pdfIn PDF document text
    • https://landbar.com/upload/files/leribofumepimupejebaza.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e82c020e---janedaginuluzawutunojovi.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210802040438_430036135.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/db93eba647b8a34282e08ab28a2472e8/gibikusosoxedafopa.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f3e504180fc71ca5d921e9ff0b87eb3b/17488902147.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/662f43554232af731e22433bce165f34/87682226087.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/72141043266.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/ridobuxobikidepeze.pdfIn PDF document text
    • http://orthopediedelft.eu/files/4318727859.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b066c6677---kafosipuzurudev.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4a3c96396e6ecb66d1a274772763b82d/lejulifeso.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/wawomobobunu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5ab1b560---10714741181.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wuwotojewatuludoxolavup.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d95e22118---18859014517.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/894ea2ef196bc38bf220d3e9fc60747d/xudixaz.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/tasizimeka.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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 18784 bytes
SHA-256: 270bbde21fd8a608de484015b1136719887478a7087ad8905a94ac022820ee4a
font_01_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 11176 bytes
SHA-256: 571155c11318089771760a3c9012224b3412db0aac5a20cf75204d4f1b9a9d2e
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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