Malicious PDF — malware analysis report

Static analysis result for SHA-256 8639498734dc6906…

MALICIOUS

PDF

94.3 KB Created: 2021-07-19 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa493ded563bd21fe0c0fb49abc64d28 SHA-1: 8c2ff6561ab8b80ba04caa7947b144bfdb910b40 SHA-256: 8639498734dc69066793e81ec20c0f3d912173932a3e2d54fcaf2be026313e93
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate download destination. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7980

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba56d95a74242282e77391266877b11/pidex.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i1c24lt5e26ml5m3b3i4abf5kl/rapubizirakokuzalurid.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b82dc805a35551fff040822236cc7781/23737861539.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc21ecf95---fipozuman.pdfIn PDF document text
    • http://shosholoza.de/file/65407017255.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/58136201546.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/94999908407.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/3676692502.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1932bf442---divifujozizebisovozufe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/079b891d1cbcd7356e70c247f044d803/biliketofobotekenob.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/32749341946.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622533349.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b963e999---66048712202.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f654202a26---vidagemijodevuxomotu.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wawikerozebuk.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a2e5d4d4---69862048693.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/98153378816.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/zukuwisuwizopudupubuzik.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c36e7cab---81541403082.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/2778635984.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/58224975896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+ashen+onePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16808 16216 bytes
SHA-256: 857ff50a985ffd397c0a74d3f1d272548371d9842c4c1976be7b291e2d23998d

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