Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccbae06bbbbe90d…

MALICIOUS

PDF

97.4 KB Created: 2021-07-15 12:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1afc724e760ffe63f010400228d4deaa SHA-1: b025977b03f29c12036e1f1ba700a34dbbd34d79 SHA-256: 6ccbae06bbbbe90d5c4aeefcc48af4d31a6f5a6dcc24df22c9c38513cb814da1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://makesrealsense.com/ckfinder/userfiles/files/29932967649.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4c92030f736b29f53a19995c6d82161f/23752442253.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/wijozunajobetedapivebaken.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/15064096508.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/vitavorigutubogamolumaxa.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/degigenaguwun.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/79n1ae8d1k7jc786nbnro6g1r7/93118591537.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fegiredolisilosok.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/34248666768.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/19/file/20210519_132735_102.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/918a96db591ee375509cb5c1b353aa4e/13645301002.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/kggd5voj48nospdbfr0gjf45i9/sifuwajulav.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/864cca6dad65f77f277e2e6350893e91/ruxozid.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d59003d54---muwexuromaju.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/3177605737.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/fc2ob36us8un82sr72dr2cu7i7/jozirikavojepix.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/33717689161.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf57bd79b2679d5346e49f335a30b6fd/kewovinipixum.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/80540819421.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/furepukupat.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/rmitpvsevno989mg55n0oenipg/jarazagererosi.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/pezizesaje.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f16b1c611---58369325279.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/07cb111e2323d7dd1d82cd9612093ed7/powukupobesira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+your+snapchat+score+upPDF 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_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 10804 bytes
SHA-256: 08b16a75f0d58074da2a6254d61683e9961ffe41f60529fc8730094bceaa16fb
font_01_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 17444 bytes
SHA-256: 74a5d4dbcd1b1fe1a9a8f6bca4ce278d59264c8bf25a441d02f74e89492a1fb2
font_02_sfnt_off00016016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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