Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeeb07aec81b8a7c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 20:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1af0478332b73358124c9b22055a76ee SHA-1: 128d8ec334eee4dde346bd3a008ee102c31af58b SHA-256: eeeb07aec81b8a7cebe997eb3cd5c57f51981a3a2de41b79aa605429df37ce8c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to direct users to malicious downloads. The presence of embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=nitro+pdf+reader+64+bit+full+crack PDF link annotation
    • https://essaidafm.com/uploads/FCK_files/file/xomuxowetixoluw.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wisalezesape.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vujasevopazuselerijazemew.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/12417338176.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/34357842336.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c016aee94c08f09f33df5d980cc47112/81073918467.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/56659589733.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/57918912285.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/rolifipo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c82438042---25651286918.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111dc7417383---mezelekukose.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1596bf871---rogugebirana.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81996175665.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xasoro.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/sagelusixeworamagog.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j39jb39sge5j2o0di7n4tdd4a5/majifatutojolemugobulum.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/61180610139.pdfIn PDF document text
    • https://hgb.se/filer/file/71765447071.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/76173235950.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/givuniwu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/76785054630.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/34767059302.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pobapidefej.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0c7c029ef0814d89dc038b6e669a5a5/84768159535.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3306a0bb47---70281432054.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/givirexewanorusa.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 22540 bytes
SHA-256: 9f9b1d7af21b4dc09b73870878606e28bf0b9838081032fa7714d486aa9b81d6
font_01_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 10896 bytes
SHA-256: 53d0f2e2d1c51c10035782e6789c0957a7d6610fd6164da6b1102f33918ce74e

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