Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a20e140b9471d03…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 09:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06bf9b8f4256f897611dc1e406e89b80 SHA-1: 6b1e18523cc018a1ec7f1ab7f1891fbc092fd82a SHA-256: 3a20e140b9471d03cec36faa74e82bb5717c654c1c544d9a10edc23f1dcbb6c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=in+on+under+next+to+exercises+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/89964596664.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/7422967096.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/50063890266.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57765437a13fef3fc2630a678e222b58/81164659879.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085cdfe7b496---pekewutumikijedawuximak.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f75e816283---lolozerexepifir.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/2061370255.pdfIn PDF document text
    • https://avvocatoboretti.com/file/7669488685.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4925c9bcdebd0384f0cdc8c9d86ab039/4852598179.pdfIn PDF document text
    • http://unsersohn.ch/images/file/liwevak.pdfIn PDF document text
    • https://emmaushuis.org/pages/lumilekevosiji.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e352a2eb4---winusigivivokifenen.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/11865255817.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ba0a15369692739bad2f50a12fd2daea/87729230355.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/fidigos.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/48502074461.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/93145979810.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/keseranarafokovugi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d73ffb93988---8991305270.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/pubigagolovonofadogiv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0db91d907444ca8ccd39f03f295d099a/17051117000.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/35740341340.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/g1bqc3497nnqth0ig43atf3er2/pubatenivuwo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 10560 bytes
SHA-256: 0b5663600798e3f0c0f9e36a2e8e828fd9a9a180d95071d314d6cc6ff703f603
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16376 bytes
SHA-256: 05b43a6734de5bb03f97b681e1e7eafd053335d1e30f2ee1c0910e07e9d5dc84
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1