Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af45eb6b468612…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 13:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd3060d7bc02bf60246a7f63f93cfc61 SHA-1: 9013b3d7f62233cbea542aa87b20e5f3be3c4172 SHA-256: 38af45eb6b468612bc9668105b23f54c7908089615b9de2b4edc50a90b81d36a
172 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and links to compromised websites, suggesting an attempt to exploit vulnerabilities or trick users into downloading malicious content. The presence of a download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9452e7db---97361103910.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161327760dba2b---matedesoritinip.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kefavafitamumi.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/bifinixiwoxikisuminisevo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vidibadux.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/55662712824.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/30895907241.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70691391305.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/nojorujetave.pdfIn PDF document text
    • http://goldia.cz/data/file/94126579490.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zuxikemovesakazoko.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8141c05c---64401124148.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/74107494827.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/93049051429.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vagajatamoxofobijuj.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/74451575384.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109080753358804.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/befiriwoxak.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/kajuzojazorovojetu.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xilewenodal.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/tijusupuro.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/94291262198.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9eec076---75422151519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=granny+chapter+3+mod+apk+downloadPDF 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_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 17140 bytes
SHA-256: d20a3dbabd453cd127f7cc4c82c9c9ea03c6a36ab44ec3c0de382b4f67685b3a
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 11020 bytes
SHA-256: 06e14031114b2f4bb3882acc528fcdbf17d8c44a85015cc15aa82263f13f0e48

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