Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ca69ed48c702c7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 01:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff638a9efad3f341f7e866deaff5799e SHA-1: c37fd477eb66820b0430f64603bc073151e92484 SHA-256: 68ca69ed48c702c724ba8d8f3d6ccb7a484a028d88d28bf0e3421c93d724b53a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pollackmihalyiskola.hu/ckfinder/userfiles/files/wazivejidukamex.pdf
    • http://mtegl.wsystem.sk/userfiles/files/ziwimufejizovo.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/pekuvosidekuzim.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/89861585652.pdf
    • http://smirna.pl/files/file/tidinone.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/33450931959.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/99ba0fc63f0f9037b6758562c2946b05/vajiw.pdf
    • http://rideabikenews.com/user_img/files/lodemuruxepalujosikebis.pdf
    • http://bebsulmare.com/userfiles/files/67129241176.pdf
    • https://toocapen.com/files/zizowevidogepoxidum.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/sawuxizudoxuzaloba.pdf
    • https://dhesient.com/media/diwudumozizojutewuwile.pdf
    • http://kaus21.com/userData/board/file/fagivevapi.pdf
    • http://hainescentreasia.com/images/file/31406702107.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/tujofusirajag.pdf
    • http://sieuthimaynhapkhau.com/upload/files/98073803570.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8961333fd---63259817398.pdf
    • https://osakaav.com/userfiles/files/94789497690.pdf
    • http://compsult.net/userfiles/file/74876084855.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q2fkpdrkki7146julj0fosc3vl/50198362032.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/18482091023.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/90718906795.pdf
    • http://soluzionebenessere.eu/userfiles/files/95506258775.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+india+playstore
    • 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_off0000d918.bin
29a0944b27884f85763e601f1759abebb37faa588f547c44073f5e4ae06115e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 10924 bytes
font_01_sfnt_off0000f21a.bin
ebf46e2332f05706fe0544d18e9b8e2ae370b371c6544c7d4de8699da39ed473
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 18256 bytes
font_02_sfnt_off0001219b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes