Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f41a7ac5bb6ca3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 15:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a83f2202b9e28518fd11bf99183f671 SHA-1: 91d948f57e2e269e27fbf6b3924a71403cf2272f SHA-256: e9f41a7ac5bb6ca3f8a71b826ee5bcb60d0d5e428db5241fe32d2c6aa1627c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=ordered+pairs+worksheet+fun PDF link annotation
    • http://www.musicboxpiano.com/contentfiles/rigawowudakuregud.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/jofubetovukujafiginituras.pdfIn PDF document text
    • http://cityfate.com/files/files/69271179313.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911a332c494---68341428780.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/sizarupagoretote.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c81653c2cccd590064230605fd8a212f/34745522838.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/03cd3aa7bee74d90d83884dc7cfddbdd/xenevutobavajurukap.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c16bf---memopuf.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/86067371433.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/99053932304.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/53175527627.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/birokewi.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/gajonexaletivafabe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fewunoxiwimelipufunatugi.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/gexeda.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b753d641378---85495955125.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0b38e9735---jirezoresafidodo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5md7e11b2m8cahjhrpl9u8rnc3/mejexum.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2432c981d9---47698900701.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/daravemazetewudinusesaxu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54044497c---99427648943.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-21/210821151709282284ojh6g0g59jgh.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/60508698619.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c44c45ed8---91405315058.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_off0000d0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 10852 bytes
SHA-256: da14c4a24ebbd2aec13b6b1973741ce9faeeeb7931cc64ba13fba39fa39662ba
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16380 bytes
SHA-256: 91f22671ada3ebb784c5536ae2d379cb4e65991900a3d213aaee58230075da4a

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