Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e563a9b3ba1ed1…

MALICIOUS

PDF

99.7 KB Created: 2021-09-03 19:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c7a824f3bcac3c76d4f0cbaea50ded7 SHA-1: 3999de025aaec3c8f53c6a592f3c3c50505e0ddd SHA-256: 16e563a9b3ba1ed1e422405c1c02207d599efdd6c81582dddf2e4496d4564a73
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised websites, including one with an IP address literal, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • 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://pristineleather.com/userfiles/file/95136721748.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/98a933328fff55ffa1c1689ba9260079/dilexerawizakikeluso.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/659cff5bfd85ed708a705066e70674ce/17202092166.pdfIn PDF document text
    • http://philboyd.com/53035244913.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8ddf99d460350d05397d8f33ee51a6f1/jidiwotufasosigoxi.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/7194181263.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wazevepuzodufalin.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b816ee1e2c---mafitanaverugufibit.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0f7f3995015bd249014f0ffe4f4b14ab/bojukufuritovinul.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ddfbd64babd09b447e774adbf07f13bb/mowaforunin.pdfIn PDF document text
    • http://0930actress.com/files/files/febobuzoxamaf.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866183665d6---zawarel.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b385bab80---7478924438.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfec736ea---fivekibujinugovamu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7c38fd08bafb4e00f4a9685ccd4f2f5/70762696797.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/e690af2d8d020cf2fa4fb82d56f30f90/fabelusegutumi.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/ramepufunajagewo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/jekawek.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e57a74e03---rakabifedewirokopulisa.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/bireresopu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/eb6a6b9835b4ec43970bbea9efedd0c5/61590322318.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/33386277420.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/79797944904.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a966o7m3od815063sp8o7qfkj7/segetukakagimu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b8629b765c2---73607032224.pdfPDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47d713192---kozamiwidilog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=conversational+solfege+pdfPDF 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_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 18948 bytes
SHA-256: ed09069a9ede2f76dd9c81bbfd2e910a65540c2648a057bfa48c5ad9fbac5e00
font_01_sfnt_off00015031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15031 10768 bytes
SHA-256: 4d5886023972cfaeb7f39c9a4242c41c10be2186a801e6ec9a93cfcb3c73c96c
font_02_sfnt_off000168f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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