Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17d9450945fe445…

MALICIOUS

PDF

81.1 KB Created: 2021-07-23 15:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 907f12c532b36d9c1e5da28610c94cd1 SHA-1: e1f9eae8d81a4b9a41af8a69da2f73dd49502b3e SHA-256: b17d9450945fe445f4bbe754c2062f661bbbb003db6c5477538245e543e285c5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. This behavior is indicative of a link farm designed to distribute malicious content or phish for user credentials. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://alliance-ltd.com/userfiles/nirapuredipulutawigopuwa.pdf In PDF document text
    • http://trunglam.vn/uploads/userfiles/file/tufiwukomusudu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/sakewazatomugisu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf04420bcc---sonudimodu.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/foparugufaxebipadubab.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8b6619748d0ef8e00849ed55191681a2/lafupanor.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mumituwubo.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/jekosusaxasu.pdfIn PDF document text
    • https://iwistw.com/upload/files/wenuzenedasowelobas.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160758e48d9bbc---nexeve.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7751dcc81bb80f3b10f2c812a4778313/binategonudamefufe.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/40891086919.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/61513298122.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bd8sgbc4etnpmovu1n8ing3c9k/83033256571.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a880579876f---gopefolodupenudoviv.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/6003842997.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f9c3400ed25b75bf73b7429286673d62/4696282923.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/22277730212.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096809290729---gateg.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/daxegukerukudejezazene.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607482bd46c2e---16412357667.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/b6k6d6s2lgv3oo8ictjsvbfc01/nixusajijuziwinoguwako.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/33247128468.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ba06f8e5---mexixufezibuberixor.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/86ba2fca1561e66ff6dcead7aa354941/nugisunawawoz.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/636cfd5ee707c074897a9e3549d657c4/sawupere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=madhura+naranga+malayalam+movie+mp3+songs+free+downloadPDF 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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 16684 bytes
SHA-256: 0c7f71fddc68abacfa498b10a1c4e5e903a070765500ccfb1a9158efcd896e28
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 11380 bytes
SHA-256: 485c52192151f22f7a3b8fe763f20137423ec91e5142380a6cc3336b8e34420c