Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f7aeb3ada44632…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 01:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e89e07ffcd87ea5dab1fb4d47006853a SHA-1: b6893c7fbdef66a0ed75c7b9653a70540e2c83c4 SHA-256: 49f7aeb3ada44632a070d69dd1fc39857987c601ba546b2b3ca1996267ffae1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=ppsspp+basara+2 PDF link annotation
    • https://nuttydog.hu/ckfinder/userfiles/files/6542200620.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/sefonatamatop.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e8ba29otd22ncl8ga6d04o3hf4/90446910984.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/49610649203.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f2c98f02f715c5bcc3bdf1519ceded2f/mukililipegoxig.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/pitamekugaxemevof.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161397a69f39b4---62347841819.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906013355969986.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/fejugu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/mixivomawobux.pdfIn PDF document text
    • http://thegioioto.store/upload/files/6455403153.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/665bfbf24a47c059eee819872180dc01/wujusivo.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/morudu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/bugoxifexiguda.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gavijorogavivogape.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/76141073381.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/lofikaf.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/32527182587.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/lorazaji.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109080022056291.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/trh16kmf4pkhal33b945tcq8od/20623371888.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/89045182892.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/moraziwiwid.pdfIn PDF document text
    • https://preciseenergygroup.com/media/bogilale.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/54920647200.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_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 9912 bytes
SHA-256: a5cde182ab1eb6d4e78b6ef34290a630734903bfb9be49c43bce65455e8f3998
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 18320 bytes
SHA-256: a0442a800ed2f1047f330978fb6cd248ab716f127537c4f052ff5c9a999eb53a
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1