Malicious PDF — malware analysis report

Static analysis result for SHA-256 9585ffbc888c3e37…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 23:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 547a13a51b3b4e7a3a946b9d21334277 SHA-1: 08d5eb69a2f7d600b6e7a19c09657869034ba824 SHA-256: 9585ffbc888c3e37bc8e0eece59eb7fd3ff559ea5525a3df0eed6c6283c89c4b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c301fd83b6cd9319eac625ed488389f9/90049203585.pdf In PDF document text
    • https://deltarents.com/upload/ckfinder/files/kexefuma.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/wikuvugevurene.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759165dca7---83383575503.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/bevir.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/voxirone.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/74634317216.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd87289ad8e---lusikokutuboga.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/desijurinudiko.pdfIn PDF document text
    • https://mytopics.it/uploads/file/nakutuzatodigisun.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca09a829bef---mobuwo.pdfIn PDF document text
    • http://sswjeans.com/files/39758946847.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/basobid.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/filudibaruferiporozaxeviz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8eb0c52eb---68885414507.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/96978273380.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/79232762274.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/periropoxapipenoxaxupeg.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/22064201052.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b34280a9f6db43d4a9dfde69a00c9c36/jonol.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072433ce0083---mafafademujixugipafobada.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda55b50ee3---wofenuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3ds+max+vray+interior+render+settings+pdfPDF 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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 11152 bytes
SHA-256: 3354ec0051d0920cca15382b0e78e4bf183b766cf5fc3e96331e717108eff0e2
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 18360 bytes
SHA-256: a3a300598fa79e65dd73fba63ceb914df8a92c67d542fe27bfe52f3fbcecc975

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