Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a2f7e840e7a63e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 13:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bde12fde60cef0768f0844e6d756b17c SHA-1: 3909b1a333c7aa0717c891586428da839e581eb1 SHA-256: 98a2f7e840e7a63e67289b3f091dc87921faddee1da75a1d68a13b173295ee8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is likely a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fgmjoto94p2au5e5ejuqf3s292/demakarilu.pdf In PDF document text
    • https://hygradeinsulators.com/images/uploads/file/82722381997.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fadugedanewu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1c1resm2ddjbb3oiumfbrdvk8q/femamuk.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/pebomumonoje.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/dulesar.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/52002323015.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/96051175616.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611e61bc29619---24192449568.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1jog12pmu47idehfmfjnng97mt/71307237402.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160856cf6ed0b6---nexozeja.pdfIn PDF document text
    • http://www.andreapondika.cz/file/fenojiruzuxidovalonus.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/57481216589.pdfIn PDF document text
    • http://pb-book.com/user_file/file/jigamoset.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a33d4d05---zijed.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/57100690293.pdfIn PDF document text
    • http://apvn.info/userfiles/file/91714433543.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0ed941e1---sorovo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hg37c0n26p7i8bio59jj6u85on/1695952322.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/re04paip9da4anlrgegaihua7m/jevopajulu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081f30382ea3---39433201426.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a401d4821cb---rinavuvaduwososuduzuf.pdfIn PDF document text
    • https://eventaipei.com/upload/files/feguzozawalisu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0d6d8480---34092583749.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077fddb39e59---93010527721.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/zegaxupinemupigusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transformer+document+pdf+en+excelPDF 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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 10856 bytes
SHA-256: e7ec70e0a2f9b17aae20d265ba4db8538465c0fc30f46e217a35be6a51ab2f3f
font_02_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 18500 bytes
SHA-256: ba3ab8db04b4ec446a517776be75919e4affa042cc4a2f6ec8c5f00c6b63a028

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