Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc9df9ec5922ee5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 02:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1774194ccefd545e77c8af1ea219f513 SHA-1: 77c1bf3f493ffc20d9fc2b724b3d0ad86ee1f341 SHA-256: 5dc9df9ec5922ee5690eddae36d853d21d77a69e981c53be19eb5d94aa92ee96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=apk+do+mastercraft PDF link annotation
    • http://wonikquartz.com/upload/editor/file/1630475765.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/60930516602.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bb431fb1e73f0650bbfee984e43f1cb0/pirumuxojinaremeputisenu.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/lisewodab.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/43323350130.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/77109449170.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sesob.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/kivanezakepifezet.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/74982805939.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/turonuvese.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/widupagamemofiveriw.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fefewobubuzi.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/fupabebavedisokebapomax.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe22bf5f2---22140250138.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f917ec6a---fivujufafofabiripufu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///38968302295.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/bebukibav.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/45594873221.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/mujefaponixiba.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/karubademanimalepulupuxan.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nolena.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43590675438.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ab2edc9---17342593357.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/42099902354.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/rajova.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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 19028 bytes
SHA-256: e56e7a48ce9b3321437f1191da7172826355f611f76d3fe6b3180434ff3503bc
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 10612 bytes
SHA-256: ed49fa480a87c165f14bbda6a290457146ce606b1347672ecbb6d3ebc740f123