Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f40ea6bdb5676ba…

MALICIOUS

PDF

87.9 KB Created: 2021-09-05 05:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f516ca5d6430a2e15e5441af6f10bad5 SHA-1: 112f4c2dc246a9086bc80b61081f2a5a0657f476 SHA-256: 8f40ea6bdb5676bab9332823b09191b33a16c9f1e02bb13f8afb86c2beb9c43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://quatang3t.com/upload/files/nixivinu.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/jijusotunojin.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4b7o09q9e2cpjri3n99uc2gudh/wobipewavidipimen.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090372eccf96---45245101883.pdfIn PDF document text
    • http://apple888.vn/luutru/files/deponuxikuzoxuxuzitovudox.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/37443585359.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/69408276185.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/84027775848.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4tb5ddr585rbpj42glrgb7buue/jujewapoxavafa.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/sivejonafusi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b60b72ae6ae6a4e4418d80a773cfb72e/zoluwevizibufu.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/84549609519.pdfIn PDF document text
    • http://billsky.ee/files/file/lumina.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24638762626.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e78271fcf---54324216010.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f0df0f408---nuluvefelifir.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1852b608f8c083bb7ead29759ce533ee/25429027666.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rexegozoxelepikoke.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/50886731787.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093425673a62---goxogiki.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/jetulixivenasij.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ddeeb0b3d5681e4381ceee1e12bcbfa7/wobuz.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608089baaa8b4---soxigetiz.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3248f1d30---desusufolowosakesurizipaf.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/wazodesifugaragew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=time+and+eternity+william+lane+craig+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_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 17696 bytes
SHA-256: fae8a9c1d667a4ecfe1541f2017c4b463416c9f01e3269f79d9692dcee34af19
font_01_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10840 bytes
SHA-256: e15fd717ff898cbda80af3b8127e63b6f173ff99b82fb50cafb02c72d5ab21ad
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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