Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fbb9c92a412a73…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 437a73e44de859db4ae82abb5956b5af SHA-1: 38c087841e4b1848c7e3fd6a54316be407b30814 SHA-256: a5fbb9c92a412a7357582bdbf68ba3a1eea701ffd183c04844086dc5803561a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing trojan by ClamAV and ML classifiers. Heuristics indicate it's an image-only lure designed to trick users into clicking external links, with many pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of external URIs suggests the primary goal is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=gta+5+new PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161480155064ce---14786842408.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/benupodamororufu.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/31962713404.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9810518106.pdfIn PDF document text
    • https://europartner2.pl/uploads/50677734463.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/84757289492.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42639815205.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/80329205367.pdfIn PDF document text
    • http://eurosolar.cz/res/file/tuxupirulajulobonomer.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43063999079.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/gafozikamuraxosodatavodi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140084e5fd37---xasogakixot.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631615889.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cecd465ee2---28081662676.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/xibegowobibobonise.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fidosirupabigozexitufa.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/205865960.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/ragevakinejeratezapi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d74460d08---jipititijororeboxegexabux.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbd89b2ded---63441001019.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/menivulemiladeno.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1cf688db---vikixibedap.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/jepaxegefizijupin.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixawedavabibabovodun.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/jezudupaf.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4e4bb9d3e5a5ad9a4608e93dd7d373cc/xolodaxuxedukajuw.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_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 14388 bytes
SHA-256: 30cbbade8bf1d32f77d7b0caadf318c3d9109e5ae9dd14bdcd5323390dcbb40e
font_02_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 9832 bytes
SHA-256: 397c1851c74743f46fd179a4ee0d3de4d324be2c19caae7a7e7ebbc3b8625fba

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