Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db4040a826ae4c2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 01:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2f321bc0f890af208f65d2431733e1b SHA-1: f4c349049b86eb0fc7e2c350f44bd4cf08f5e66b SHA-256: 0db4040a826ae4c256559776d215fa7ca5d2a20706dfb756709c582527165816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--e1aazeoc7d.xn--p1ai/images/shared/file/rizezagorizasutigomudo.pdf In PDF document text
    • https://riolospettacoli.it/filesUploads/file/74313427384.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/90135076564.pdfIn PDF document text
    • http://exima.kr/userData/board/file/48978727000.pdfIn PDF document text
    • https://davnosti.ru/upload/mavelimitelopinabadirat.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0ca1e0996594931da80b55e8feb8adb7/39325081293.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/19650201909.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/14702925859.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614223366da30---xibopamijami.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/saronekifutogudege.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/podidimiduxikusagol.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/muzepuwosujumaj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fe210926---gisix.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/71319518370.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a37da3f6---baforalabokiwulitojusogi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/panazajagetugese.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kilabawutuworasediduk.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/rotogef.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///99221485311.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/bopisunokapawijidan.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/50463341452.pdfIn PDF document text
    • http://iscelenie.info/files/file/50276251907.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/pejogezubazuwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=super+smash+brothers+melee+isoPDF 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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16708 bytes
SHA-256: 67a4905840448735d36c302d6a1d648af3ee4b6a7c180431085640b8912dbe0b
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 10728 bytes
SHA-256: 689ecba9a451d5e1a7cd3d48ae4eba18572591957d259b1564d1d48c7bb0f147
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1