Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc1bb1a0884a7cf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 15:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f24695e767cfe55d42586ee7b072e275 SHA-1: 72096af46bc5c5cfc9f46350ff286604d1385323 SHA-256: 9bc1bb1a0884a7cf946b92cef4c28cbeca42cdab82f49150188a21b00b7b2eaf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=algebra+questions+for+ssc+cgl+pdf PDF link annotation
    • https://alrashed-alsaleh.com/userfiles/files/71011570946.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854c3ee1d52---86950712943.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8367ae2ecbf8a6a289a741b84ae1a926/laxalelasupuzasubuv.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e1023151f74a12cf1c1bd88959962bf0/biwedebi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610297a14c8f0---jukerujepibuwov.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/tukeleziwutibegusedufud.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bea735de032---tavunepimikusap.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e01d8f5f69ac1f95ace01b381fd8ce6a/rakarov.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/76688060893.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160989966e6387---tolajiteludofebejo.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/najediliwuwapowazovijanu.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/lupovaginagitekit.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf0d94238---gowusubexu.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/komibutizelenagekijuzetod.pdfIn PDF document text
    • https://bursac.net/userfiles/file/587433570.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/17982061116.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/77c657d35467af7d599ef0d795b93121/danubasur.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/votitaxeris.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673e6aafb6---sawemonuvexevogaxesi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfa222391c---39828481821.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pfuk3tb6cdn3vrg0eetkh9lr35/51434705393.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/30132270431.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d45da02aa---25215842355.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_off0000bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC88 11164 bytes
SHA-256: 520e8767c31286494da67d2a8812353e0c9298a1ef963d55cc98e6223e2c384f
font_01_sfnt_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 16628 bytes
SHA-256: 1bbace6c16be4a942f52d5f95f44fc4e248a5be36fd92930945addff6d6c156e

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