Malicious PDF — malware analysis report

Static analysis result for SHA-256 436d94096ed08eb6…

MALICIOUS

PDF

75.0 KB Created: 2021-08-20 18:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 240b3bcecc9dc1eebb9740a865bbcf8c SHA-1: b6a144454df53b577e953fa8105a2073afff72b7 SHA-256: 436d94096ed08eb6b781d82bd6ad243cc2ef3e1247cd4b5b55cf9bda5272f4d8
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 CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://myucmas.com/userfiles/file/61169442741.pdf In PDF document text
    • http://flexa.cz/docs/file/947258401.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e61395702---11790809970.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/josekejadomanuwufe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0382b610---gigemumewawapesakori.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610be77725718---76614323766.pdfIn PDF document text
    • http://grupophi.es/uploads/files/burekixoginuf.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/67181000332.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf03f0ae95---wijovif.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/58909597500.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/rekesumarijar.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/xupusewikukut.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/45668214506.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/mivarotosatonotodo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xinitexotafotuxurore.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/negemuwovanevem.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/goxifawetofa.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/id4ivkc5fahi5nq428h1pj45s3/68017177186.pdfIn PDF document text
    • https://go2germany.ru/files/file/dikonimi.pdfIn PDF document text
    • https://tepihtrava.rs//files/raxitejimatilatinok.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b284c8377f6---losinuwiwobezu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/74261699282.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/29926938737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dossier+professionnel+exemple+rempli+fpaPDF 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_off0000c269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 16688 bytes
SHA-256: e6a93045920f124fe6f6cc2c63996f11bcb44c116bfa515757586d80172948d9
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10524 bytes
SHA-256: 8d38a89ce8d64f7872bfdf830120229611286b0d56af44da81cab76fe3703704

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