Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8073939cd21e2e…

MALICIOUS

PDF

116.2 KB Created: 2021-07-19 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 039b9f5c185b3718188c7144c07bae0a SHA-1: ecc554e58f18f13271e655cedd97c5f8aa90224f SHA-256: da8073939cd21e2e9b5f0d2046f10bb9230b7f1d5735c5169bdbcbb39f2a7d13
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • 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
  • 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://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba56d95a74242282e77391266877b11/pidex.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i1c24lt5e26ml5m3b3i4abf5kl/rapubizirakokuzalurid.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b82dc805a35551fff040822236cc7781/23737861539.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc21ecf95---fipozuman.pdf
    • http://shosholoza.de/file/65407017255.pdf
    • http://paoladebenedetti.eu/userfiles/files/58136201546.pdf
    • https://cottonweb.net/userfiles/file/94999908407.pdf
    • http://alexlunacoach.com/img/editor/file/3676692502.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1932bf442---divifujozizebisovozufe.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/079b891d1cbcd7356e70c247f044d803/biliketofobotekenob.pdf
    • http://ingmontagna.com/userfiles/files/32749341946.pdf
    • http://youngshiny.com/userfiles/file/1622533349.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b963e999---66048712202.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f654202a26---vidagemijodevuxomotu.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wawikerozebuk.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a2e5d4d4---69862048693.pdf
    • http://chinalanpa.com/images/upload/File/98153378816.pdf
    • http://timnhanhonline.com/upload/files/zukuwisuwizopudupubuzik.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c36e7cab---81541403082.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/2778635984.pdf
    • http://globeksa.com/ckfinder/userfiles/files/58224975896.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+ashen+one
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ff7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF7 16792 bytes
font_01_sfnt_off00016808.bin
857ff50a985ffd397c0a74d3f1d272548371d9842c4c1976be7b291e2d23998d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16808 16216 bytes
font_02_sfnt_off00017db9.bin
488549937ef83e82c09bbf4b5b51250dbba6704e1385c029d9fb57af081bb302
pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB9 18272 bytes
font_03_sfnt_off0001adef.bin
a7f0e361f6681d253e9d7067bd56cc0d701ea44d3fc56de6bc810f6934ababb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADEF 9832 bytes