Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8de9fb20210404…

MALICIOUS

PDF

81.0 KB Created: 2021-10-23 11:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 03765aafd68d925b797db3501713ca06 SHA-1: 74fb3022fbe54b3d8ad5e0df4dc12e3e17a8b602 SHA-256: fa8de9fb20210404939ae878b29f582e10a23380c787f0e2d3fa1fb422a61a1b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/uplcv?utm_term=find+out+your+love+language PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164913bbcead---dimobimupolomuginuxajojid.pdfIn PDF document text
    • https://healthresearchinstitute.net/userfiles/file/64892339024.pdfIn PDF document text
    • http://iknow.pl/files/file/movasi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161639b0323550---loluzimukupovogademaze.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/28135405067.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/77097242099.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/42734102716.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/xewexojabujagepefo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090215374273499.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/digowulax.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/vejarafudolosabibalo.pdfIn PDF document text
    • http://distributoram.com/files/file/680025757.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/megidulasipekejirujijus.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/9565530249.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/91280346330.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/rupedilosepaluwalunul.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/54fea43d2cb5832b9b8cb7324be91c0e/80084914357.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/ravaj.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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 16968 bytes
SHA-256: 4658ff3d65d846327ec286e9bc92e64c053f5235ea57ae9f81e83bf55178ae19
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 10512 bytes
SHA-256: 759f9132d123e0e69fbe3aef73775fc7347914ce1325cb8439732a5118f2ba24

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