Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56cf9e30e026156…

MALICIOUS

PDF

95.4 KB Created: 2021-08-10 23:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c757806e700b9089ad47de01925a4917 SHA-1: 7626756e20b0222a8103efc3f1defd12413dee3b SHA-256: c56cf9e30e02615689fa54f3f8779361779dd9c84698bb7fac92c2aa79a18691
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nadiadsa.org/userfiles/file/52228145989.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0e0b5bee7---keruzuvuwizusovipever.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ce1cc42---5190590598.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/18601053170.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sorevagugikodoxapipunelu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86643884a---vupedawabasovoku.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/doremob.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16112748ed1267---memunenudizonibit.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/mabimowuzasapopigufipi.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/jijipejenigetafisu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608917f931c5d---lifasokubetubigovalakij.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nudefizegawokibipijodili.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/08c53b533cde72d50810e7aefea36150/96506613764.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tvgpbtekghi79ghmtu871hhih2/61274017105.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/kujilogifivulapezevor.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf3518af4---12289177426.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f60d709bf---luxuvelopulinawofizoze.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/15650000536.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c136bb1de4---81455876289.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/kuwabemur.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4e02268c9b2318830a3befa708e879f4/gitemoruninodoxofebijamij.pdfIn PDF document text
    • http://minerva-collection.net/files/files/23269177794.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5lmvvuhit6a2de2vjun1m2f2v1/fazanijuvasozuwimekeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+tv+launcher+google+llc+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 10864 bytes
SHA-256: 87b36b67dbf7f2eaba7c64395abfa6d4b8a025f6d817e5df87dcefdd64a7f87d
font_03_sfnt_off00013fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC0 17520 bytes
SHA-256: bcb05a30fc3a84d1e3856283b8d2a288fbe1976902384d7e5c73c3cd3e3c0774

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