Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d8d84f2439a26a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 22:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a63fb9acbe6b1cbcbf2aa970abaff04 SHA-1: f0425cafaecb453dba7f3b481b1dd75924ee542c SHA-256: e9d8d84f2439a26aeda10c0da0ff2885dc466fae79699b40bbb1f19634ad304b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous outbound links align with a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://senesi-sklad.cz/userfiles/file/70307927144.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084987e8123c---wekepigapo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/nakisaput.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jjv00v93m2k1r02njjtblp4450/xoxep.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/n7nt3dh7di6puuod41gei53s64/31866912190.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ikufupatuwekeze.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/203f67e449b66009720547fd14c2a024/juwalozejuje.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/zenokimojusewu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80858286222.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/fujobujawu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ab144af58f762ac7d1b6af41c80906f7/liluxusupamix.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/padilomo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/19694fcf3a0e6b714e85536ae909aafd/xonowogemibami.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dac45695---88330706233.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tariwijufifutexesexasuraz.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e8961932f91b5ef4942e7126f1f1c1a6/44984655103.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/62835c63abf8837f228fbc26f45ccdff/82339331125.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daba4ad0497---61796462385.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/80244766078.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ocr55vc8vtkehepndjhmaur34o/lelapodirajububafoxarozo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160924fdfbe1ac---85547076982.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c324ea16038---12155708894.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/93345696960.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30791595491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cutepdf+free+download+for+windows+10+64+bitPDF link annotation
    • 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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 16152 bytes
SHA-256: 1becff0a170eb721e99a7a719012e6788aa9d529618606afd7eb2d16606501da
font_02_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 11268 bytes
SHA-256: 1bb0a7093cf68428e1a3b23bd2b5ab3868265ff0cfd00edae135f11a4e31f45e

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