Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b18f2d093c3137…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 15:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1b7f072fec66eacfb15f7f231a09f1a SHA-1: 18683e02955627d6326d528006691cf327b31318 SHA-256: 28b18f2d093c3137b9f4c310e9bb28f01baf72dc6afca18d08241041f24bf975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://qca.ch/userfiles/file/30031738826.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59dc0d229---63127874232.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/wemunilifafokuzilifafekum.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/25694506970.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1026b2137d72119c2571203ee454da14/62789469459.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f113ac2269---56438733611.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609452b150a32---vabuwiterot.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759ff1da434---sesuzo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/nepemer.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7j4rnbigpdsvohjp15jur230i3/46241528492.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cf59e650a7ec639ad6ebad608de9d3ba/46215991943.pdfIn PDF document text
    • https://area5srl.it/file/konapemiribilelunugo.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/segisibafiwese.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f71a40235ef---91221192964.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/reninozirodimuna.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/48492477924.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/22929589965.pdfIn PDF document text
    • http://atrsara.ir/resource/files/3263550523.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/66553245342.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/17869856640.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/u30gi3f9muq1tmflf2haphcpau/94495377895.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e169c2c8b2---widenolamag.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m4h75t92hnnic11dfk0j2s9r7m/67731277710.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b593dd7f29bcef170fd200d9eb67db77/putugevigidemapuf.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/razuredofuwaliletol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=amalgamation+accounting+pdfPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10644 bytes
SHA-256: bc568d592b0b065b5fb7b7d8d54c3858edcbeffbde5e6cc6e4989c1e1676a762
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16740 bytes
SHA-256: 17cac0cfee7e5e95d6809a3ec46ba7bc75308a2d077610bd8785eab422357461
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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