Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce179300ca3bf37…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 23:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e5fbc0a4b098179f405467b8d27d05e SHA-1: 9bc535821b9031698d6151d02afaf13959825608 SHA-256: dce179300ca3bf37225261a0b43ab47042106cf5db06c51d7492d861326743f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings clearly indicate the document's purpose is to redirect users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ivelinabozilova.com/userfiles/file/36619073464.pdf In PDF document text
    • https://anakaygame.net/calisma2/files/uploads/jesuwofireko.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/vejukemaberelogumurupo.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/duzitogakake.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135866a1ed4e---51449921365.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613977a246409---nakuwesusasubanoxopi.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mipafuwuwaxok.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae7a1eb0---87832659866.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/394efa45b2aaaa5068bcb07f3e58e819/51644485441.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/rinodamusedamiv.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/48002747827.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6376253440.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1c07c1cf4f553c38156c485758f69ca7/15691963978.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/95353998550.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/gezunogokajajugonebutaz.pdfIn PDF document text
    • https://t2sc.me/userfiles/xuxotolavabi.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/60796977543.pdfIn PDF document text
    • http://aven.su/userfiles/file/13116989395.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/28597513035.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45264d36---getomazus.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/demorepej.pdfIn PDF document text
    • http://delve-cr.com/uploads/89745366310.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/70334335821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+delete+internal+storage+in+androidPDF 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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 18364 bytes
SHA-256: b1e6f2bf15c04d697ec31f9216ee145c151fbb2b9fa7c03c0cc70b22803fc974
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 10500 bytes
SHA-256: 203d47d2020bc69fabb0b212fdd2f3c27ba5da58f3ede5a4b06c2531864f32fc