Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16b30d1b30a7fdd…

MALICIOUS

PDF

78.3 KB Created: 2021-07-24 22:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec84da89308b3de57219196657f251aa SHA-1: 5c0d31eae4deb97c0ff28c92ecbfbb8c1a6cd7e1 SHA-256: f16b30d1b30a7fddd802113c8f2b7813309d9841d0fc30aa535d184fe092b3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to various PDF files hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://allycatering.com/userfiles/82289341621.pdf In PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/joguj.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/72f4fcacfe7f10d009fd28083e8117d5/taxilifadusovofire.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/wotelelebokezi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef69dd9465---13316619272.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516153324474331.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828b4da43ee---wefusafavatupab.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/tidufafikoxa.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/zumulov.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ef229db2---65766064038.pdfIn PDF document text
    • http://dgjst.com/upfile/file/29741481051.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f844851ee---fesexexi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/fusemoxax.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/807596d4c2c5be3d9baf91e5ce3907ec/8281971914.pdfIn PDF document text
    • https://cape-electronics.com/media/file/bawanekuzow.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ipg3gvkmtlrnprte52q1e9v0up/94243951422.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/65fb9833c6d03bc4ba0ce9d59c372f37/vanusukatufagobagububub.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/pomomudepobewebuwajit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3g1720ai1cd1dijikqrkg6ec03/rozogobuxededatumiruri.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/22r0jt6v2tic5m9d3eq762jha5/96059223907.pdfIn PDF document text
    • https://ebooksweb.net/files/file/30934342745.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5huqh93nbqml0c3frts83ccnq6/dubab.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1905fcc97629d6a1baf9390b7f43735f/vatuzefetubo.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/83839819203.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0005d3d643e829c6c088d25a203df06/vedir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=turma+da+monica+jovem+edi%C3%A7%C3%A3o+50+download+pdfPDF 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_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 18268 bytes
SHA-256: 54db17374135cb4a69fa7b20912ed5ed66b90d6187a2a09e0ab8a4d35134d107
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 11580 bytes
SHA-256: 3d56a6e6bcec06a68a67afd356c3b64bf5cfdfc9857675c547d744ea65331cd6
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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