Malicious PDF — malware analysis report

Static analysis result for SHA-256 117df79ce132ca4a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 18:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdf4ac4dbc7318210514a4eb1722f113 SHA-1: 31d5bcb7d75e63bd1e76630c4aa006b8be8ae44f SHA-256: 117df79ce132ca4a504d02ef1c5526b85d8fdb32fb44227e0033949b124fd8e2
156 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 point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/8573779256.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2oaoghp8uooev9p8ckag5pbok6/52906211211.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/desokuvisewatojemawad.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/32835724131.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/31475680323.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609850eac21f4---zasubapexifobesomuradil.pdfIn PDF document text
    • https://attack.lt/images/files/mozorux.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeeb43e37d---xalibutufiwev.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d534bfb24ebf64ec81e39ee3d8bec739/8363636184.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/35730072595.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/73440373251.pdfIn PDF document text
    • https://reniuved.it/file/nazuweguf.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/57418758358.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/jowilonarexuzufaporex.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/nemavizoxe.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b411a6adde38293572db3cb44f130037/27218010660.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bdf8aba0e---mutebukevapota.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/6581302927.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/23349565247.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c190e5f252f---78809795043.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abe663ae67a---96095349579.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/89780852858.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3ea8770c1633b13000858549fa43e7ce/xurojagemitifenod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pneumatic+conveying+project+pdfPDF link annotation
    • 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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 17356 bytes
SHA-256: 40b2fccbd7dd71c89b2ec65a88ed702b151d7cba52d725e932a0c8813b1130ee
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 11160 bytes
SHA-256: 499a6a8cf574d12bba0a0e9b9cbdd00ba45fdc72067b185b3741fa7ae4e309b6