Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd8609ceb4bef8a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 13:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7e5ba8a43d3ae857adf90faec95e310 SHA-1: 28f765affea46ed2a8d9d4c018a8e630f0caffd8 SHA-256: 5cd8609ceb4bef8a138e400562e095bb9163036f323a37ee0267d4bab4a45155
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is part of a link farm designed to host or redirect to malicious files. ClamAV detection and ML classification further confirm its malicious nature.

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 http://infoegrafica.com/userfiles/files/2099712334.pdf In PDF document text
    • http://proallprint.com/userfiles/files/35113355942.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/39868600677.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/56628900787.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/josotobup.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1fd0fec3c5eaf65c7b4b8cfadaab155/basikosibagidu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8455367c9---rubagimenimizo.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/31921677591.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/potafixi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/10033696920.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/40998706985.pdfIn PDF document text
    • https://12shio3.com/contents/files/14549358561.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/sulegosilizomiremal.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/xezufenim.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8000152d0---47254947663.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xuguj.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wimorudizaboroxamol.pdfIn PDF document text
    • https://adikmanis.com/contents/files/xipanabakimutep.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zazibelenonidamixoxupife.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/dagiwuvozojujanakadop.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/nanabodixisiwoxaki.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/43086961507.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/nojalililipivanoxupusi.pdfIn PDF document text
    • http://ijfbn.com/editor_up/6759733369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=diner+dash+adventure+mod+apkPDF 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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 17572 bytes
SHA-256: c0be6e8307b7c3ed71471a773de387f776b84f400e42a53e05950c306b866aa2
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10872 bytes
SHA-256: f34f2a5bd40bf20e460e952681d0c6f862d6165d32a42d35e0624677ce71e1d6