Malicious PDF — malware analysis report

Static analysis result for SHA-256 066e5f4482fe4c69…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 13:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3ba77dc6bbae1263fad37f4c3c36b545 SHA-1: ed3bf4f00e93e2484e209abb2aaca41bbeb276b7 SHA-256: 066e5f4482fe4c6915f4da7949a395a9600c4e4b3c6ed3036ae8a1ec78ab022f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://polletnv.be/uploads/files/pivadeviwejoki.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609061f7330b3---latapabudoz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a0e2f470---mulovukujivomosenovigi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8f70a79ae4bc32206f1461b2097ffe73/48489975385.pdfIn PDF document text
    • http://dd-eng.com/files/files/93452970082.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/68628639226.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tatawegorab.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/nijosewowegawabunigotir.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/lekirurazaka.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/42363843630.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/2160427437.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/87369230304.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5101cb023---37005577808.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rqqd7hc7fa27m7b7ji9ns76j1u/19965939400.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/49930432228.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/joraripema.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/17735637130.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wugejot.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609999705926c---kenezadegudefivilun.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dbad57d6b---37149166942.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/5916925606.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/57004338399.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f022617cd1200f23738d8b5792ab8dc6/72444971305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=feminismo+para+jovenas+libro+pdfPDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 19620 bytes
SHA-256: 4d6014781f546e5966e02c74790742230f3c2fc8f3c1cbf3c14e2fccd26f2e55
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 10876 bytes
SHA-256: c1add27dafdf4038f99975f52c012b297d8b740ef8e2deb654e6cd4860cfd4f0

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