Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce82b27644bee9ec…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 05:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a9fea14eafbb0e3858e4debc77c3336 SHA-1: 4ac3a1d7652aa56f187b72394b0cf35f71b6ccde SHA-256: ce82b27644bee9ec1e690f26bebe44243283605bf7e24d4433d19ecaea4db25b
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. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bhk-aindling.com/userfiles/files/12055727315.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pesavutesumeja.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8623f04be---43237759129.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c16355c4596df356f5ab0ec23388cf00/nimewikatoguvasoweleza.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5tgc0asr64l9qe95tpfi7unv90/pewokisopasegimusekoles.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cb5e3389---fawivalodoliputa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/51211933927.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/84252309303.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/av2l6uif9ej75nvrccepjs2qkn/34107928805.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb8430003---92569514157.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7574d76b6c707db8315600bea82925e2/vosesoxasefopexajesobegis.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/jufakekefosigezer.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bfa7f1cf0a6fbf64fd8aaddcb2e5fa33/lewipave.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/girotuxarajilo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2414b97c24---judosotipugopelojuluxog.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/59900628995.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/nazowifigebexikulurisirod.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb903afb4b---90550008475.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d025cbbea---wenizezetevinexanivi.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/65423412273.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1d5251ccc1d5c17472750857908caab9/tijujexasoxosavosevobijiw.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/gojajitij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9b750c0d0a5033bcc0f7afb609f9c795/56639742331.pdfIn PDF document text
    • https://aspirans.com/files/file/16379131329.pdfIn PDF document text
    • https://ocw.tw/uploads/files/bisofukakizuvogedawor.pdfIn PDF document text
    • http://mp-journal.com/media/file/11851705240.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df43397ac---sivuzeduzixij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=photosynthesis+and+respiration+model+answer+key+biology+cornerPDF 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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 17356 bytes
SHA-256: 906491fdae7e26ec2e3c67664f12376598812ff33ec8cdf06d5f2ef1c47f492b
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 11396 bytes
SHA-256: 70dd16e3a11691792dbf2d780c2529b17aa637602badabca8dc639f89ecbbd6c