Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36d9271b9e95039…

MALICIOUS

PDF

96.1 KB Created: 2021-06-28 05:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c3571cdc5c790841b905e896d6fe6584 SHA-1: 6770a4e633c6e7c1c58f0a0f46f14ae6624d7cc7 SHA-256: a36d9271b9e95039f99d17d99dca134c36680c722c172d22e79582e22f5ed629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links are likely designed to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://inwebjor.ru/uplcv?utm_term=drag+meaning+in+malay PDF link annotation
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620000791b---69995182016.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c72009fc4---bevijogip.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac2065ea02---nuvefasa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s68n9ulpq3734r0l80ccqqed0n/24210264446.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2045fd7289f6728033cedf84f926e51e/6458512840.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6b640fbbd66b44477e681a44cbb0c59/zivazasorisagewuwugokinu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b582ef1a72a---66505821133.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0e49873374fb9c06e54dce6be47fff59/mefisuzakodibawakatagure.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84652009876.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079804988560---jawitejobugolusipagapowuj.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c4b339dca166e57826286533956c5b59/puwaxoroxizi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200328797627.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096f6367101c---govovajakaviralatit.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b615be00850---foradosusapa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f135022bbb880a8a20648badb27a5f77/kisakusidetox.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe69b7fb0---tewonimovotosugugawefagis.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/19899981922.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/99025697309.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02d7dda5ab---51307271518.pdfIn PDF document text
    • https://windsbs.biz/files/file/rolasibagajur.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0135e33a---begetejepoxoliwalikepi.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/viboxoduzatowuzeveni.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/vofavixubemul.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 18164 bytes
SHA-256: bbb9cdfba7e42c2f4abc8835d9647c6a44aaffcb6a2464c2b8e83f24ff6d86c3
font_02_sfnt_off000138e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 16472 bytes
SHA-256: 5b26f56f3f3fea925bc485e4ed444749e90f5fc687fe68bac1038d2f38c71f37
font_03_sfnt_off00014fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 10180 bytes
SHA-256: e5a4b049cb702ef8e8408f71ab975e0e56f6bb1243fd276ec42f6007910fdb75
font_04_sfnt_off00016675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16675 2356 bytes
SHA-256: e296a370362df7ed241ef7e33b558236c61ffd60723c704d53b2d719b6e3cb2a

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