Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c152c8be6309eb4…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 15:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de50610b5c9f7d417b74aee7b42d348b SHA-1: d02b72ae1688db18876b3ab12026abf9d15f5d87 SHA-256: 5c152c8be6309eb43e2172c31da48380d47920946aff47810b334ae975657256
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially malicious PDF files hosted on compromised websites and disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of using password-protected archives to bypass initial security scans, implying the linked PDFs may contain further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://sibconsulting.com/contents/files/18727189469.pdf In PDF document text
    • https://butchercurnow.com/img/shop/contents/jeluk.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16156c7f39f6ad---lunugisuvupukiw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c90fe91aba771143fab1808da5b629c1/54463411849.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/98504341315.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/71075690246.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/mebavimonoremokewowupuz.pdfIn PDF document text
    • http://119pump.net/d/files/65352948637.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021091315591466.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/pezusotonunezo.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/2191790441.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021092108522169.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pesiwajufomedebidude.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/rukubukipaboziw.pdfIn PDF document text
    • https://asiapharma.la/files/files/vubulikekinamekolet.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/14868505296.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rewejinit.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/vilivim.pdfPDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155a55509975---68360744117.pdfIn PDF document text
    • https://marosme.ro/hirek/file/7578068340.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/70c5789422938c70d7d67be4bca6010c/vibifovesulejekiwavufela.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gukejifuva.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/71077197178.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/99754876069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=airedale+in+notPDF 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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 19120 bytes
SHA-256: aac7d78df9ef7e828207a5182be6fdb308a3dc0a952bab8cc3c26e322c3b4018
font_01_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 10056 bytes
SHA-256: 0564576c2e0e7db712eb5a0d5310c88f76ef5e9879d9899534fbd57bc48748cc
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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