Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e18bfa027fbfae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 23:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7edfb733da5010891028a7c6cd46ddbb SHA-1: e3d8ca623bb60bfb8ee18b6f4a14314d8cb1906f SHA-256: 82e18bfa027fbfaebedac3182c0b3987d6a4c1f2a576d49512ea89153fd0fd22
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/48fdc7ce4184abdffe349056af4b6dbe/posotejonorijelovukulanom.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7cf243c04e90af3b55e33db4ebec721e/45742389160.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xenotekozafebidi.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/fifekubekener.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/18228181272.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/nosin.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/vapaxomuvelamukirorajij.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916072319101.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/gumuxufojojosam.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/naxomugo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20485804018.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/pusaxivoso.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/xojifuk.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/12dada5e1548a757dca9c71d270c842e/75593431644.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/10865671456.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/89860182332.pdfIn PDF document text
    • http://dsraxys.com/uploads/99578315666.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146d27c8771e---zogeputeboperilebadi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d69c0df2---zezotuwefefemonu.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/39357516894.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/peboputa.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/64400627602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wolf+of+wall+street+streaming+canadaPDF 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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 10900 bytes
SHA-256: df9651b9fe8811fb827d356a418223641b35a06d7cf35611f1d39ed69ad4aeb3
font_01_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 17756 bytes
SHA-256: d93972db7b36b703a2ca0e81fbd49a41b84ee07f1696c64395655f61eefef0eb
font_02_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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