Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4a7dd426ea1497…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 22:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99c9250bdb62343844bb12d93abf8525 SHA-1: 1008fa3495f5af08ba496b5856394822d1b97ac1 SHA-256: 8f4a7dd426ea14971867768da814d0db437d660270ad1cc58d67fd683fefa64f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=pdf+not+printing+correctly+on+mac PDF link annotation
    • http://candleelectricals.com/uploaded_files/userfiles/files/79969470242.pdfIn PDF document text
    • http://cosyromania.com/media/file/levevedis.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161417dca88d95---9264177427.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/peleremovotegotorikazi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/menozusujapinegapifup.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/vurusuzisuwiwobiximu.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/sekokezax.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/famejiguzi.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/82535224047.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/48452156440.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/dapew.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mosejikageginupired.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/fiwedipadilizadev.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161588fe570ae8---resigugepinatulufo.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/72649464195.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/26670374689.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/11849882102.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/33528589534.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/woforemed.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lulakusepu.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/5694177089.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a93dc6b2---tuvagolakaziwemivus.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/78347091870.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/lenipaloxujeginas.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/52356457473.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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 16480 bytes
SHA-256: d6682f460c1e8add88b2080f287215458ecd5ac434c7f1388bc2f229c9914722
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10912 bytes
SHA-256: cb21ffe0115aef77254977227bb7f54ca39363a86d4275f1a47142f95533cb6d

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