Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eaef0e4edd817c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 09:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50f5861cd89649f6cf0a98e1856c5b1d SHA-1: e369e92ab9848dd467372845cdb2d3e451a239b4 SHA-256: 43eaef0e4edd817c7df783c4ecc4556b84cf5aff6f9708e9898ae3df09dcea82
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161413851e496b---22774463054.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/74761751112.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/16c612c3d8cdb4caed9521e35c3f4308/ridinibozipiwiva.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e858903e99---boduvujupejujewudovixomu.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/netekagirodufomamigop.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/zixapewutepu.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/fipusomadezevukuxe.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/worosos.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/bevowoxekada.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zevuxotolezibugolunuz.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nevolagipune.pdfIn PDF document text
    • http://fitviewer.info/files/file/24838961329.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161404925b3648---64022328535.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rizokejebexi.pdfIn PDF document text
    • http://mayjack.com/upload/files/71788765118.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904043733360929.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gerisifadekawavakiviruzur.pdfIn PDF document text
    • https://susta.vn/userfiles/file/59523805780.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/topikupalejuwavewoseluk.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/folofekarerowalug.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/vejedewep.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/tojopelu.pdfIn PDF document text
    • http://eko-uklid.com/files/file/diloroxivedepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fight+break+sphere+season+1+episode+1+eng+subPDF 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_off0000bf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 10984 bytes
SHA-256: 9c971b69538bc981a5d4a0cfc4067eb07b062c64d5da3079d667d0d63b97a6c3
font_02_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 17760 bytes
SHA-256: 959eca5bde3c5bbc116d68d996509f60a8df4f8a0708d2bed449e4917a6bec66

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