Malicious PDF — malware analysis report

Static analysis result for SHA-256 9215aaad3df1eef6…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 18:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67b95903aeafff7b85f45e8ff74cefa5 SHA-1: e407d511763565235bf5b1c8e00cd1eb28d0164c SHA-256: 9215aaad3df1eef6c56ea53218372afa1ab54ed1f46c0615b81b965e5607077b
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 compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krevue.cz/UserFiles/File/supuxamin.pdf In PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/43496018224.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/44506037422.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/55701219669.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/15147402330.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613707c39a3df---gizodidulurojunelu.pdfIn PDF document text
    • http://gskrem.ru/img/file/gagovubonu.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/loredidupulonorurizavude.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7222c3a6b---vufipigujejimip.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/takirelalufugot.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/9056456731.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/fosanunipubi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dufof.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/wumatad.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161492bcc074f2---rakewateriwob.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/guzazewerelulitar.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/vubusosetumasu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16148212eac80b---jawuse.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/66695577093.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908185244056376zu9tcsbpopos.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/katok.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20042074210.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/negutevejufiten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aggressive+openings+for+whitePDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 18924 bytes
SHA-256: 424a64bf28974de4a4ac9aec8a6d43b0f71aafc636f6c3e3324598b60ea477d8
font_01_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 10564 bytes
SHA-256: 484b81cd3a451c3118fba84492201ab9c38de5fc219710cd50eaaca4d2160e38
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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