Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb981ec979c3f4a…

MALICIOUS

PDF

94.2 KB Created: 2021-07-04 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 203c688083ba32f7907342a1c6c14796 SHA-1: ef96fad009221b3311d8656482918e2ae527d274 SHA-256: 0eb981ec979c3f4ad2646ee6de77bac525735ebaabadf2f1b5467882f3e29031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e3a777ec---zavakesezamux.pdf In PDF document text
    • http://taxicityplus.ru/userfiles/file/84371924875.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/33499020713.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/betotavapix.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13756eef3---38848678275.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210523191854.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4df1474aef22a0e603467b27b237286f/vedezufuvirevuterag.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/zikikuk.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc40441aff9---2001610338.pdfIn PDF document text
    • https://afayl.com/userfiles/file/66366531083.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gapijodolibowatenat.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lidawerezagaxiwijoxepude.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd660bc7b---57645466421.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/gifula.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/42472651307.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ef107e8f07f498e83dc7d3fbd6fddcd/tijapikiwefu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a2eddf09a7d732866dc3c81c31c56122/wukozudureparoto.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9f830113---xopajovavawikat.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sapedi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18123044683.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/deropizo.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/55757205286.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/18649580396.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/v59fuhatk6ptnr6cvqjtfp0uc0/pajudidadejepiwekamuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+fun+they+had+written+by+isaac+asimovPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 11164 bytes
SHA-256: 2db347de437af5db51f750994b11a191bf62dd9de9c64e9ba70c1eb0947e45db
font_03_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 21092 bytes
SHA-256: 43952935cede33b630d4e8ce6ac6b4d79d855e1a06b27a6c8aad4e256060248d

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