Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28dfcb507307b20…

MALICIOUS

PDF

96.9 KB Created: 2021-08-17 19:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e7bf32ab5e8752dfbc360bc5e255051 SHA-1: a7470fa5c6288b18a3129ba2178caf68a7930f5d SHA-256: a28dfcb507307b207eae97a3d230c27ecfac6f990b16b32d2a3823fe9cad2a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://abpaluso.com/upload/file/37777427548.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/bae524550b3a08ed4aa1d26c85054d27/sinixevidab.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd44cc83be---fememerijadonaxarisorufov.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046481cf4af---7263996904.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210726_0E9FD9EF8BB17CA8.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40b633e995---20480330681.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/74nbksltkqdlmcjuhpurj4k01u/59951612526.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gajafekodijelekuteb.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f934ed1848---tinejunetogonaputubu.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82334906112.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/92039622411.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c821b22f5---70949524122.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/nowefazatijewokuledafabij.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///19069337593.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160713c94e515f---7815060370.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/mupogerejigine.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dfaaf0906d6259cc26259db7a67b4571/beridome.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91058ad05---fimokafapefolilodoxu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/04007db8c36a833c70105b45a5bc10f5/togukarom.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/bafasejivavuxijuk.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/99ba03747147e90d2c1bbda641a91813/66077506016.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/341252081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+size+flywheel+for+ellipticalPDF 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_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 10728 bytes
SHA-256: 02361409568f3137caa05d57274413be591cd9c01fbce29a4848788dfc00ec5a
font_01_sfnt_off00012cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 17828 bytes
SHA-256: f1d3132e5a0c967cb0fa4d140b3007f5562104d677fea5dda9c66cfa3c5a1315
font_02_sfnt_off00015afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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