Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa36e0aa165d3d9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 06:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b3d2655d0a022e35b8912f60d15f1a6 SHA-1: f15651979091100bb443e82a9f4eec7644b624fa SHA-256: 2aa36e0aa165d3d9bb6325750aab87b0fcc91498d59e21a3bc819d4f8e896d4a
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. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=prince+of+wolves+pdf PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6d8df1ff---92134625068.pdfIn PDF document text
    • http://topflexsports.com/uploads/temujebexijumafosef.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/44538544729.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/66989932675.pdfIn PDF document text
    • http://topflexsports.com/uploads/tajubokakun.pdfIn PDF document text
    • https://5uempat.com/contents/files/fagubisokobevurebolidaw.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/dopatuzijanujuzebit.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/tubabe.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jijedugawalebomipi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37dd96d27---felubegodamasuvowefuwo.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/wosixavo.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_010132.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/92042017772.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908010825.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/semidi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139050a936c4---karofilafalelolirozijupun.pdfIn PDF document text
    • http://arucax.am/user_images/file/63706356045.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/niwunil.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/kozirevuzudiboz.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/33936575055.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db26a0b569---woxiziwut.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/79965856882.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631719768_1.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nozogivasi.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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 10508 bytes
SHA-256: 06683008c11689394c66a78eefe19c8b7e2d4184314471af141db5d19bd3e92f
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 20244 bytes
SHA-256: 7ba7aa5d3534db1ddab25c4bb39cdfb41e29a280c9c3aac0540de007451abe9c
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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