Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39a4db9de17441…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 19:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 330c15d9e9ba94470f924661d398f0cf SHA-1: 71e43b95252e81ff7e8cd28060d298dea7a53d0b SHA-256: aa39a4db9de17441f277254bdac09b32f673c10286f0152f510b7e0d9d0acd12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs and link farms pointing to various domains, some of which are associated with compromised CMS uploads. These elements suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=doctor+who+androids+of+tara PDF link annotation
    • http://susasoft.com/upload/userfiles/files/68274470334.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jexezosonalebosem.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/gemovuxujawiw.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/jujalulaleguber.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/fugidavimezuma.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/gatobapedumukovofifoke.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/beduwoneralixas.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k4ppmhbuds96mdtl5bvq0c88t4/kagiwudemikajej.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/8997998373.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ea628d5e---sewejebotapasonuzasipog.pdfIn PDF document text
    • http://seritour.com/rsm/files/86552961732.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/rusumodifiwotibazuluzulo.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/bonewowusir.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/nodem.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613320adaa826---66745661524.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8a130193---75608565701.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/75993153188.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/55219514922.pdfIn PDF document text
    • http://373113.linker.tw/files/kudux.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/11457811629.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/11854220977.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210916000300.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/37728524.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109021722475062.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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 17912 bytes
SHA-256: ff4df27779e30927964a1b285832bb4f65264a99e636adc54f7ae37397b7c6ae
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 10480 bytes
SHA-256: 4cc6b23b2c1d9f6c73d5d03393858b109e1e2b62459aa715b9010ebfddfa6c5c
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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