Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5dea736d9b22e8…

MALICIOUS

PDF

73.3 KB Created: 2021-08-15 19:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5716aaaebd9eda96f301604ada0f73a8 SHA-1: f5ee74edf709946ce910ae5e8cf1a54bdd24b7eb SHA-256: 1b5dea736d9b22e8f0535fa4718654466a8b515c61a8362ced2c4e537b5a334b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=be+crushed+by+a+speeding+wall+codes+april+2021
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9792bda41---rapevodewosawuweja.pdf
    • https://mecaniquekd.ca/upload/file/kulexas.pdf
    • http://techhssilverbuffs.com/clients/61416/File/gixemavadib.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dk8n7lqts2oklds4f2l1172tq4/kupegexowinugufetevase.pdf
    • http://jtour.vn/userfiles/file/gesofedugixozoxur.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/juxafetobugivuxuwineni.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b10070bd593ba25127af4e30841804ad/75878585097.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f928ab8fd8---ferutimutew.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/21ee6a8c617a6574e82cdd7c2b39c07a/dawamikituganidelokineka.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850a61a781a3dce0f11510f62bf0d441/musib.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/36799bede01f260ccd84961d72f3f205/21542799565.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/41f1b8dc8828ceb368e6c9192cc0d291/fupesunev.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9c098742---zefur.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608754390aa0f---36042771273.pdf
    • https://keluargamimpi2.com/contents//files/79790301311.pdf
    • https://ortechindustries.ca/ci/userfiles/files/rujajekarobozusajixomuku.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/tekanafokewovon.pdf
    • http://cukrarska-vyroba.cz/UserFiles/File/34122358449.pdf
    • http://hyderabadibiryanicorner.com/admin/images/file/91449432571.pdf
    • http://www.flamanville-76.fr/upload/file/fuzitonamukakawuxo.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/joveg.pdf
    • http://gyorszol.hu/userfiles/file/84106927263.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jogajoropivaxisubutope.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/38d74672d79df06efce94a573442a7d1/roxukanorexatavutubewa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc59.bin
530357742093f5910c9ab320b4dc3909f14b576e44aac5dde0dd0ca4e2d9917f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 15744 bytes
font_01_sfnt_off0000e488.bin
5200cf2bd9996881a14d348d0ed9e7d1ad7dbb0936af19f0ed69a828e3695341
pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 11480 bytes
font_02_sfnt_off0000ff54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 16792 bytes