Malicious PDF — malware analysis report

Static analysis result for SHA-256 986d803b528e5264…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 17:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf10ba32e526e3ac36f3d2fc1d1f2b1f SHA-1: 2da341a39ce65e19307521926bf944851f11cc28 SHA-256: 986d803b528e5264920623dbac691cb05e16de6ea209e0c7c09458d3428203df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL findings strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://ort168.com/upload//ckeditor/files/72138028269.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b080930a4---81981053961.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/39241434308.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/80940025024.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/73866314367.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd10acdc3f---xojewojubemuwunudub.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/68121861704.pdfIn PDF document text
    • https://tonitomov.com/picture/file/fazimatizedaxakegivowob.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/fupidopavolem.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/boribonevuw.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/novevurexunilififosi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/32d2e39ac0769b6bd03f7c7bd9f98632/jubuzez.pdfIn PDF document text
    • http://effekt-film.de/files/file/89779975939.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/rebosejimijewezo.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/vopadekowikur.pdfIn PDF document text
    • https://avvocatoboretti.it/file/tafigufasi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087f73a71903---zeriwipajitekofifusur.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/rezofimipowexexo.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/48286049717.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d81a4ee2a---94496662351.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/31538950198.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/27322146831.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878273dd6---vularulisumezagotule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compare+decimals+to+the+thousandths+worksheetPDF 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_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 11088 bytes
SHA-256: 40449cb9ed23ace1dda1a582c943f1227bdce343d30cd63d787ed15b67d397e8
font_02_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 20164 bytes
SHA-256: f51a45d38187f5b5942db57c56ca19bccc2e42947b432299779043e0b01add1d

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