Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb4e5e8b4c645f9…

MALICIOUS

PDF

111.1 KB Created: 2021-09-15 13:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17127c516b0f08679782e186094885cb SHA-1: cc9ae7d0542d13237130c828b6caab9ee3f269b4 SHA-256: ccb4e5e8b4c645f9f9117fd07fa808ac594cf14a7dc595c3388021a15ac0480c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload. The presence of a link farm on disposable hosting further supports a phishing or malicious download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://mkpstroitel.ru/upload/files/burowat.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d0d750f0---dekusuluturosubolir.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/ledazabib.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/96683612613.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210915_3A7DF48251DFB7C4.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/82539689570.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/4153832192.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/notiwubimuv.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065e6504bd---bezeliliremuf.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/14915597619.pdfIn PDF document text
    • http://sinners-party.de/media/file/14630933074.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/38481731236.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9a5b967b---kititevapik.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/54578020146.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5feddc836---pimuwesowowatopobaravawis.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210903033021_649463817.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/nixogomajinanomegaf.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/38652215083.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/93779382231.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/20348804435.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pufifaxovigibar.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xiranijejodozekegida.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/8099272640.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/jusesurawa.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/42675520520.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9a4e5c48---remikoxabegekowakuweg.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4fdcdc95de6ca53b6aaef08d2f7f453f/dukafiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=super+mario+3+mix+romPDF 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_off00014cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC4 19136 bytes
SHA-256: 86a64027953214be39e43857360bcc7a055066e51a5dfce32a406283ba47a8c8
font_01_sfnt_off00017e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3A 10444 bytes
SHA-256: c754b11f6fc52cd8c9f5f97d94116e4318e672ff39c2c86bd6092db1dcbf362a
font_02_sfnt_off000195f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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