Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ade30d039d06931…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 05:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fb48cb0e351a47b5979987e64da405c SHA-1: d036a3f22128be0e2959967a7940d8265cc38bbb SHA-256: 6ade30d039d06931849923ac42d7da1e2e479487deb3b834b47c02aa8f662fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection point to malicious content, likely leveraging embedded JavaScript or exploits within the PDF structure to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=name+number+numerology+pdf PDF link annotation
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095be0cb9b18---fexuzivafopimojenobofumi.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d49c7f7e5d383417e31869f9a878c902/97963316117.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a358ec0195a9cb665d25e20629310549/xumawekijapubixe.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe5106657---povonabipamutunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f0907073---88116084756.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161040200b4482---16306757422.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/45179256761.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/19832053812.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/90872593627.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/69108614427.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7804db6ee569f71c23c36300f1f5fe3f/58908835159.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc807c42b---88272598563.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/628c44a1eb0ae6b479f26ba609e4a807/sitojafetopa.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/59582687632.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/4d0395fls4738umr8ddkgp6hcb/jagadazefalisilixedaxuta.pdfIn PDF document text
    • http://art-ball.net/files/file/81746731110.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/80840358599.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xetikowomiwogiwizokudof.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kafobidaguvolufiwoge.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7929b8a712---674372300.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65cb6009a1a28ccb7965b6d22f5a043a/88411979078.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a10c822d9---13152302334.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/47489923487.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d629058f0f23f95eba7f7a9af6565bd4/marimapewowuzetutogid.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/17598814063.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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 18216 bytes
SHA-256: c5958bd3351e34052259241048a4d907d82677f1129dafc02683678e8eaf8d87
font_02_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 10812 bytes
SHA-256: 57a4eff911cd001beeedab763bd7d7a94e892ead0240c26512dece7793bc9a5d

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