Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9d3a0cacedca0f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 04:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18d33809d3dc6cf4571eafc0de9cbb25 SHA-1: 007d32f06ec39b9018cd08accb2b4c8fd7172dba SHA-256: 1b9d3a0cacedca0f576ade2e6f7092122d9c3141d8681260073f7250a25676ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=tamil+baby+name+boy+pdf PDF link annotation
    • http://bioaec.com/userfiles/files/15122842777.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/76558051974.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vekup.pdfIn PDF document text
    • http://chinahongji.com/d/files/90181288092.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/79509516936.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/xorusuvefineniziwo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc60e322c47---loxekejesowuborekabisekar.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kebaseralirizetexoduwo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/75728814920.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117281188365---simelatonuzura.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mabatazawikevurofijade.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/68107010127.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/gixip.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/vixavawopesetatoxa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931d3153fe5---9563773434.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b95098126---mopaxabefoxenitaxezawefa.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/18cojd5vg6q2gmelrojjq4a306/18531822160.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba6c1a2738---36658694747.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45261978760.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/vofutedolasinamiw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17fe1c64a---jukosenipeko.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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 10508 bytes
SHA-256: 67fbf950e264e6fc8c1decabd523b5d43bfef156eba07d43161e74b215ab2c2c
font_01_sfnt_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 17264 bytes
SHA-256: b1bc9b22aee08fe39df05e39a92c59c19461b9ac3c51a00e3f0df314a58bec68

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