Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5ae6e1a92df6f5…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 02:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d77ace75146af7baa873ea1b65a0a654 SHA-1: 02c4b70e2aec65ee7ea82486efad7605b4066525 SHA-256: 7c5ae6e1a92df6f527092c58274192914d99e529c8ef8b123568b902ccba63ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many hosted on WordPress upload directories, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=commercial+bank+annual+report+2015 PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d65f6bcfc0815b6f5780b57de5f09c36/baduxikegamuwaduruz.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/tifafukupigufazutakulowuv.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/936d80d8d9ea80d0613e9f2c5ae1c893/3794969538.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5ab2821f23735dc0bbf2a0b62198adc0/genurepilifaxonu.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/13988345408.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/136493014260c2d0458663f.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xosuden.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9mipmfbql3368dj77nhfi67689/daredipowulixo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/feruguniwotusugulojege.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1ikmh7f59u92jathgdpt3hcogg/60234998349.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/673beaefe6869ef2d128760b06a746d9/23268981271.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/16791132796.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/93407195323.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/15285873169.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mesinan.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af69719923a---16368030634.pdfIn PDF document text
    • http://fini.hu/userfiles/file/30478637948.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/58670646252.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ac7b5be8c---vuwisobef.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/zatefotiman.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/69620085856.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0e254687e3c7fa209178540802f54b09/vixunesodefudu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fc5039ee664a41c3753f169349647dff/46682708954.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/podofituzonilenulokavo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e262ac0c4c23b1c06a9c22af533914e9/saxuzibukuzozajakewe.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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16212 bytes
SHA-256: 6b1efa3252d1d5674e93a1b5e9e7010169c5b626e0c62df3053a7dae1234b5cb
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 11156 bytes
SHA-256: 55ac4f3153eca25e68a9fa8b5005f09d39d460eb7f1fd5d4dda31543ec4749ed
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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