Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38890f3b048fd85…

MALICIOUS

PDF

91.8 KB Created: 2021-07-02 05:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cae35c003ce2aedabb4a8b2e8a9796c1 SHA-1: 9dc1458d61c3223f6a4734e452ecd0a339d48a60 SHA-256: e38890f3b048fd85d5ed466b4d1675f34671b36da05d4290f94f05ecbab2a62c
156 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. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://smidgel.ru/uplcv?utm_term=two+eyes+for+an+eye PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d44f772a71982a614a3740a5e20d4c0f/99133094876.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/91rgnqmfsi2onvia8e9ghh9hm6/sitagozugax.pdfIn PDF document text
    • http://apsons.eu/files/file/wotonedufoxam.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/winunuzowatodag.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/fawexaratite.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/vegibekabikolavir.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/12609276641.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/247j9sjocnvjo4r4ctrht6ecb7/40979073451.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf46a595d---vinazasakopalare.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608979d567e95---82144138168.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af39f58521.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/apdshffhl9rdkkcngqsv8aksj2/miwelomuxisamumopisabobuw.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4027c321---7441794443.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609988228002f---23949263556.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a3ab9abf7d03b0489ca85eeeecba103e/lobegi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a0921e9fc15bafc10f06e399180cc52d/92175302229.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01704a806---14424511645.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///fekaludulowe.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/87709436652.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/wediwewewize.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nasosesafetava.pdfIn PDF document text
    • https://pmms-online.com/assets/file/domesezel.pdfIn PDF document text
    • http://scantech3d.com/files/dojagubufifabi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be63e23f2f5---39336910983.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb7eb52de---tozipumo.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/boxejoxolopozodusefawopu.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/revibasodu.pdfIn PDF document text
    • 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_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10136 bytes
SHA-256: a067c8f7a5775b216b47b3493329b1c1911ebfed717f1f9f819a90a01d2bdbec
font_01_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 17664 bytes
SHA-256: 8225436af3bfca8daefdfa81e6e51117f6fac57cf68a2e4a4200e6435e3e5663
font_02_sfnt_off000149ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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