Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f720c5aeb819a1a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 10:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 962cdaa7a46fcb232ce988b73bde80b2 SHA-1: 5146369b18fd93c4f6107edc8ec1fc50289ebc7a SHA-256: 2f720c5aeb819a1a3fe35c8f91168089969de2c4a2e9212df592b61f7cce5d0d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and embedded URLs suggest an intent to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://catamma.ru/uplcv?utm_term=watch+harry+potter+sorcerer%27s+stone+free
    • http://ilkyoukais.com/Images/Media/files/jexukevomobulixezumap.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/099f15e2add35068591b336a468c33ad/20891850270.pdf
    • http://studioingtassinari.eu/userfiles/files/jagosunugexegenalizib.pdf
    • http://annabarons.com/files/files/10412292044.pdf
    • http://julianina.dk/upload/file/41585471199.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/pupigodupesodina.pdf
    • https://chief-moving.com/editor_upload/file/78370450420.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/livajokosurobasade.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134a22aa8c75---mewasebekelafub.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/gemedodogofetewexet.pdf
    • https://ooo-kenk.ru/userfiles/file/95479269429.pdf
    • http://bimbrlata.cz/UserFiles/File/pabosatabow.pdf
    • http://epplast.com/files/file/7683028157.pdf
    • https://unaizahic.com/Files/files/40438881917.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/satijowowu.pdf
    • http://e-hematologica.pl/users/file/79821632660.pdf
    • http://vasekurzy.cz/userfiles/file/nikozo.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/50526698173.pdf
    • http://generoussecurity.com/uploads/86189255913.pdf
    • https://dptech.vn/uploads/files/30745725529.pdf
    • http://flyingwedge.com/uploads/assets/file/xexasesini.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/jilaxuxelezeralo.pdf
    • https://namphuctourist.com/userfiles/file/62759185606.pdf
    • http://888spirits.com/userfiles/file/befanuzoromodo.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457336d85d2---kubapibekomozapowevixaviw.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A4 16792 bytes
font_01_sfnt_off0000cebb.bin
e98abd047a33cca67c79192fcf1ecc8d316a3444c818d4ff0659805d38d5d1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 10580 bytes
font_02_sfnt_off0000e6fb.bin
f205b7a9550055b3d82aaf630244327b41648e7ff2d01ff957d8df4f44ff9d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 16292 bytes

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