Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e1d2ac86996e19…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 21:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 354581effea6cd002ca4a1eb57242e49 SHA-1: 7d64726401f3405b8a8c86920e646e867ba8aa55 SHA-256: 89e1d2ac86996e190b44bf92d0d1748c48101d3af02717b2a5ca559903758397
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, some of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the URLs serve as lures or download locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e053b3201---wuligobefonaposobusida.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/15141388875.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/99291067477.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161315250ae7e3---lakufabubirovizej.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/nixaxekoveba.pdfIn PDF document text
    • https://tcremich.lu/files/files/63947083376.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14208947047.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/96406180913.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/80547767257.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xurod.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613445a4f1309---47978222765.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/fagadamipomu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/77335676087.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/weburatemabedipozu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97f4d53ab---barik.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kelifaxirimusavat.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/73307164419.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/37825156445.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e26723d0f---5846809933.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/tusefuzikujinuk.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/3656527501.pdfIn PDF document text
    • https://12waktu.com/contents/files/gividodejafut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=deworming+cattle+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_off0000c37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37D 16580 bytes
SHA-256: 9a0c62ef93f69bf827b53af20eef8701439a2a5a79aa0e40c36d5b7ec134e633
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 10884 bytes
SHA-256: 0264e7832cb4d7d45c2bb26e658149eaae4b0b4c21d9c00848989ae9dd1aa09d
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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