Malicious PDF — malware analysis report

Static analysis result for SHA-256 c111883e96e3116d…

MALICIOUS

PDF

102.3 KB Created: 2021-09-23 00:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95d380a066c7ef10cf9d3bed963d6ba0 SHA-1: 7fc01fefb24249f1f21ba338ef59d9bc3d5fe1a1 SHA-256: c111883e96e3116df5577ad96d5a57a4537c94555d33f747b8613da86d33e1f4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery information from the user. The presence of multiple external URIs, some pointing to compromised CMS uploads and link farms, suggests a phishing or social engineering attack. Although no scripts were directly extracted, the PDF format can embed JavaScript, and the ML classifier's high score supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://kamnitikamini.si/upload/files/67793181037.pdf In PDF document text
    • http://silverspringabw.com/uploads/files/nuvakomen.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/70703162556.pdfIn PDF document text
    • http://klpa.net/userData/board/file/zilasegozujatodufasitesuj.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/jofamuwewagizolisapo.pdfIn PDF document text
    • http://millecolori.it/images/file/dojevolodusutejejemobe.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/11431196471.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/86987170981.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/27623761649.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/29557567089.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109160029385453.pdfIn PDF document text
    • http://www.bash.cl/media/file/sutudof.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/redigodumewafomudisax.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pipuzurajodugifo.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/19842738508.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/27664591181.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g212lh7prk0pcs4pq4apq2h3c5/selulebomowexal.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/romozuf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/501d38f973e2463d8851cd1e1fe0d85d/dusofozuk.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/texixabibeti.pdfIn PDF document text
    • https://halkum.rs/files/87391407279.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/kapodasasitekurezutijama.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/9954456095.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/27529806921.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614576d9e90ce---towofopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+face+recognition+libraryPDF 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_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 10716 bytes
SHA-256: 162119b2de60a846dcd622c84e8e6477b36f343e54bbb3d56913a1044cbd50bb
font_02_sfnt_off00015cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF0 17644 bytes
SHA-256: 386d34b32ee9cbf1fbe6eadaa0f912a9ae7a5eb4ead322bce87af8a5172b45e5

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