Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e23512ce7abb6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbd700fc66f689f7c1d91d48f7c60fb2 SHA-1: ef638cec1b8b6e5a3c3d2f1edb6354897cbb1c21 SHA-256: 5a6e23512ce7abb66d7122a63b187164fad824c51bf7034e9c73f07ad1db75d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content, such as phishing sites or malware download locations. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=minecraft+apk+full+android PDF link annotation
    • http://ruihuitax.com/files/file/fevupusese.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/povuloxevefaxizukuga.pdfIn PDF document text
    • https://penal-garazh.ru/files/gepukagexasipiguje.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353304dc957---75944594058.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/bezenajoluzibapara.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jevuzidolo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/wuwawovagoxi.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/99361764714.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/53527595789.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/92667572042.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/66937719918.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/93c964cd9529db84dc604c3c8d0f4133/vetiwibefutubabijapabi.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/58887969355.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/bonog.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161305a29a737d---wefemazoridugokezukopi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/77675246013.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/relaxowejejog.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/43827554022.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/lebuxarila.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/2550bbebcf4d7650ca740a495b56f7d3.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/zojaxa.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/meviz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8226fa9e---jixuzaroxirubo.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_off0000b951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB951 10628 bytes
SHA-256: 4788b99ede954394a805b410a2197c308a81381bb6942de63a92beba950dd685
font_01_sfnt_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 15616 bytes
SHA-256: b7946c7ed0b20f58540d3cbcf9285b85fe8b4a5e26b86de93aa9868745eafe9b
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1