Malicious PDF — malware analysis report

Static analysis result for SHA-256 878f9239e7b5bd7a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 14:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f3f6b86ce0cd4aa7e07f19b58a5ca923 SHA-1: 70cc55a2be638ea38a39f1d79604fcc6db5435a4 SHA-256: 878f9239e7b5bd7a4e94db9cb4e91d908f0b6acdfada6d56d47863feb43eb448
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=divagando+choro+partitura+pdf PDF link annotation
    • http://lepal.sk/ckfinder/userfiles/files/6620577413.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/adcbfdb93782c38885dcc39743ab751d/91594611995.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/36386360433.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/99502484768.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/defejevutejuvakeremoma.pdfIn PDF document text
    • http://asfalon.com/__files/file/36049912305.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/85185553755.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/29676109986.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/47019644004.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/ronaf.pdfIn PDF document text
    • http://alltechsro.cz/files/tunigimilirerarapenelar.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xosixukejopovuz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a3b3c2e4---wititijexekolusetiwavejed.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16149301c017f8---fatezoxiribini.pdfIn PDF document text
    • http://iphysiology.ru/upload/fejopafesalaramev.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109021520312302.pdfIn PDF document text
    • http://vlajamo.cz/images/file/61171109344.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kabofonefafime.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/811926a644843c84ae574ef2a3d84ab4/83949094602.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/mototavuwe.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 19084 bytes
SHA-256: f00bab867d81e65c27a6a0eab477636ea65ba084ae8103d0748436ab4ae16ea3
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 10720 bytes
SHA-256: b1e42f7b98d21f9b2bf303fde7ff00cfefb9c95deed5f0f5f61de182ef306708

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