Malicious PDF — malware analysis report

Static analysis result for SHA-256 e447022ac5508fe0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 09:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51cc42c8899b8590fd8c1cb1b01c45bd SHA-1: 8e85dd2fd2ed9de1f715d53ddedd6be13b97ac77 SHA-256: e447022ac5508fe0491d6a2710cfadf9bf759bc16706a5d0bc0436e0e5df5415
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of multiple disposable hosting links and UTM parameters suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://oniceh.ru/uplcv?utm_term=hd+streaming+apk+free+download PDF link annotation
    • https://detector-billetes.com/Imagenes/file/81644481377.pdfIn PDF document text
    • https://conrays.ru/f/data/86335103005.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d3a4335c---xezixilepifeve.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38534620689.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d873186b8---salenupetifelififiteda.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/12611102409.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/rimizimi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613483953a260---19631185349.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/45711226691.pdfIn PDF document text
    • https://etadelloro.it/images/file/78910817429.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/ruvalinolinop.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210919_1564CA6F04DC60BF.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kiruwixadonuvonemif.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/fesube.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2nqveohs69hhgunf7174pcfre2/36139122812.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/tirukum.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901211709.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613002fc65fa5---87941511464.pdfIn PDF document text
    • http://texmet.pl/userimages/file/77790112458.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/furafa.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f8109dd0da9e2929cb8c4b5fcc3f097f/defubomededurizaku.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///gekimututot.pdfIn PDF document text
    • http://robbes.nl/media/files/58155922524.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903040509.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/48810140579.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_off0000ba67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 11008 bytes
SHA-256: 651089048a621024c617c27cc2160f936bff85bf2160580d9b69ed90f31482f3
font_02_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 15916 bytes
SHA-256: d7c7c511498717b53c60e8727f2fdfd6f237883ebf06cf7e20030d86a4807ae3

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