Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dac758238c2f1e6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cc36da2fbfe75d50ff9b76038d69236 SHA-1: a83a92e94ff48741e28be47e129ac7de6ae8f696 SHA-256: 2dac758238c2f1e6e0406aac119205848519751ef9a2009ffa9ac6a6b1e9791f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nbnjl.com/userfiles/files/kitomalor.pdf In PDF document text
    • http://inventory-acepipe.com/images/uploads/files/69664740062.pdfIn PDF document text
    • https://kaparatt.com/images/File/36642664721.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/30479794653.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/mevijikup.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/tijano.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/zozuvugolutejoji.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5a4a318d78a84fc03e3c7240a6ae84eb/wibimakabo.pdfIn PDF document text
    • http://aa-nusd.jp/mapisuwiparadaxexozovip.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xutifulumusopiwo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ecd9d6ae---pagirowolibadugev.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/77987713730.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d02da5c5e7b44d97869baa9e0c1f3586/94127856793.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pisefazefarusejav.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/75835103773.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zewesetifar.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/funesejixewoz.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14824977028.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zoberinenuwadifufam.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191225677592.pdfIn PDF document text
    • http://schokofontaenen.de/idata/67160275537.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hn3sv5scq1as2t3frda2t7o9ol/vatiwikoxawelowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=java+degrees+to+radiansPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 18268 bytes
SHA-256: aa2f940670143cebe0d957a280e624555bf224895597722cfd464e56d1906c58
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 10436 bytes
SHA-256: 7d521b2d1dc701f4e991314884f7067273f2e03e7f6180dc772ea19175049616
font_02_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1