Malicious PDF — malware analysis report

Static analysis result for SHA-256 f706332b49e713d1…

MALICIOUS

PDF

74.4 KB Created: 2021-07-01 09:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 89c526d8478892cffd37ffc6f42d9fff SHA-1: 9135a937932c197fd6bbaf30f2894b0b745dbbb6 SHA-256: f706332b49e713d1aeef3b6f6e011c27b75e7446bc3fa0b328af0adb036e2b47
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as a distribution point for further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://audreyheselmans.com/_files/file/1578694725.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/59e1a0bb05d2550908e1b560a817ee21/kugozuzaziraxema.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zagonutuzafizuteja.pdfIn PDF document text
    • http://hasyo.net/files/file/gijafobutaxape.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/88231243473.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/mepivixexipinu.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/36627057082.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/31635539186.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16088f289dff29---11454786283.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/54fdf03aca0e086366aec98cd5a86ca8/jonepomelorijujanufebu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607188c19cdc4---suzikaxadegewopepajowo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c924e705bc---nodidodewo.pdfIn PDF document text
    • http://mp-journal.com/media/file/44499088940.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160757d8b0cbb0---welumo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/093ba5cd4dd12ac2315d5b21163fb125/47278145402.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b9c7eea0---97249182846.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/wukelutuduxugaponuvise.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kisatav.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/resarutiga.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d81580c96d37263dd074ebd0aeecce21/ribunexexiwuwo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/51190296023.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085b064c0124---perazebuwijef.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6427809eed9933323c22a6775f74880e/sivakilono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hip+joint+painPDF 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_off0000c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 16056 bytes
SHA-256: d3ed3824a36bb53fc202bf4135a996798caa61a014bb52dd978a0e6de607c0bc
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 9920 bytes
SHA-256: f67faf25c2a7fab852913a7a284411e82a74f228d45504985a244311a30db943

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