Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e10140e14b488…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 13:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5bc43d129a1394fa553728dd3e1977fe SHA-1: ea211c99a03b0e2eee16662b9564cb457a47a759 SHA-256: 8d6e10140e14b4887e2982c8b7d1f66b417a1b3a912c09937534e8e39b246cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload directory, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://matsusushionline.com/uploads/files/naguxiwimorubafosaliwob.pdf In PDF document text
    • http://rlmlaw.com/images/edit_images/file/75595351138.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jixavibazif.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/49063514566.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/jugirelagajari.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/baxadarenotixab.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/70992170339.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/53476275985.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109110156449575.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tosoxonavujat.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zuvobufuxetiwemutatibapa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/510c5bc6a52cd4982a8dd34930102828/68112367874.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76121240786.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/verujemodikalelinado.pdfIn PDF document text
    • http://cloverdiamond.com/file/82406120258.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406a603f9f1---taromufiviramusazifo.pdfIn PDF document text
    • https://wmu24.ru/media/file/20745449481.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/53467021048.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/21221264691.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140073e6b340---91931417924.pdfIn PDF document text
    • https://onlinendttraining.com/files/54633102510.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109022115117112.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/33583061154.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gofudoweduxelaweg.pdfIn PDF document text
    • https://aspirans.com/files/file/nalirulekibemeropisida.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/migawowafifitedejorafam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=guest+house+paradiso+streamPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 10644 bytes
SHA-256: f3db136ad3494b20d19686eeb1ecf18a2ad63fa6a4c7d77e75deb2183f7c8d32
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 17704 bytes
SHA-256: efa95cff28d5de19cb0982484f420b522df27b65296b1e2817daa2b52602d95d

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