Malicious PDF — malware analysis report

Static analysis result for SHA-256 85087680ab4f1bbc…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 23:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 999eb66fa38accf534ce9952f6ad8b20 SHA-1: 0d9431d0e488cb18c6f03680d09227dfe5e2f2e2 SHA-256: 85087680ab4f1bbc1435da940d0377806a46d8f98337a6c8823daa11e5197487
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://archism.ru/uplcv?utm_term=ready+one+player+one PDF link annotation
    • http://ranjitabiswas.com/userfiles/files/dobigimufi.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/55893366277.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/zubujebami.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/nometurenif.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/148548632a4ca0d3cef2bcc2c6137807/12963643980.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/72336163604.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_8477E2EE0F43B6C7.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/57240260291.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xesovidoluberoko.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/81050531333.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/zevibenalanebad.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/16821856787.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/85706075549.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b914a03b88---xupimoperajinuzimifiwu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/6199933435.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/15653215346.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/22328653048.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/tuvazirimuwowugus.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/wobokefasakizukibulasuma.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fc2678fa---51451626932.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/doregilusegademovibok.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/11654927429.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6e23924355c5b48a8817dc6ccdfd17e5/82489900469.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/vemokekozivazi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161475f83be2b8---fogegebofipowo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/52702717864.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/60094849783.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_off0000b6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 10188 bytes
SHA-256: d2f60155835b0b98b955fca1f9005e9415bc6961483308fce5a151a16032e095
font_02_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 15376 bytes
SHA-256: 8f3b5be404d7329e19edf27da80fb801a898b824fb15aa626cd3d4edef38ce57

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