Malicious PDF — malware analysis report

Static analysis result for SHA-256 33444d28b05f35a8…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 22:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a9dea5c1f66ef8b043df359b8a02d9a SHA-1: b7a89b3601e49d6d6865b42f21c13c3d4f17e7b1 SHA-256: 33444d28b05f35a8984d3f53e85d548d17d0eeb63f37b0e19532e9fae4aa0b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate it is likely used as a lure to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a81106b1ce7964c0f5b516a7dfc352d0/96004982258.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161c5412b931---43735256307.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76052194474.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/82852705482.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/63033303532.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161347be720294---99875897922.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9734784725.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/34452011879.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/mapetibiwujumozoruk.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/nuserazikonon.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/69523700819.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/46686791859.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/87570436382.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ddfeef1c7630f514bfeb9722cbc05c1b/wojitofobibarudeful.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/losikemogubos.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631761630.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/25008716424.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pabunoti.pdfIn PDF document text
    • https://patc.fr/imagesfile/10055438880.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/pubax.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/fadewimaligevirok.pdfIn PDF document text
    • http://1carl.com/userfiles/file/teweterajeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=thinathanthi+today+tamil+news+paperPDF 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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 10820 bytes
SHA-256: a9805f40a848590cf225025149ee05f3203c69fadaa3e6d808c7d3f40d0d9495
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 21888 bytes
SHA-256: 9b4e13c9c18fa23358d14e0acebff20d99e526e8fb6819864093abd29a7d35b5