Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9b8af4f588bd78…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 14:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19c4884dffb10a521b4f4353f03d31fe SHA-1: ab5a961db62180d275000aa9d17d12e5cbe33144 SHA-256: 3d9b8af4f588bd784d28b6207f368a536c4dc8ad8a828ad0dcc21538634e65d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aaaxxion.info/images/file/poregonovonirumofaza.pdf In PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/bujegol.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7642eae5289e94af983d82a16c8695c1/genuvotogelikupuzapo.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lutururexugukoputuf.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7860464a0b3133a1ad9aad50ba1cc7bd/77042814336.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/72970881193.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092faab5a840---zozemebewojo.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/82361450862.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/nebedevebizevo.pdfIn PDF document text
    • https://promise-land.com/upload/file/rewoxalozimapapuwefa.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/70945160654.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210505093440008.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/83330456121.pdfIn PDF document text
    • http://kleiberit.ru/files/file/60690195188.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9361a155---11277302603.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b2568bf8de9ab1e895632c1978688fdf/57535252242.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jelifisi.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/90c9ff899459a889a6fface298999827/82480910792.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/86899610893.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2a9610c3537177f6b58915ad2b848b07/75380429867.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dcc231a87d32a0d8cdf800fc532c96cc/xamowosotunulawar.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/09e0fb3dc11b9f3f932a5cf37df41030/83744710096.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/9970545144.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49404643c9---17303409071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tropico+de+cancer+pdf+gratisPDF 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_off0000c5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 18048 bytes
SHA-256: fe34dee50c13ba4013fae12053aa97df8ca3dfe3d27eda8fb4389f36e1c074a8
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 10712 bytes
SHA-256: 1899f8f8fffdbe6007d329811d9f7d218dac13064699606b1c99cfbc9871e69a
font_02_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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