Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b746416e655ad0f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 03:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58db0daa7d63c39baeb0b4a4bd3a1bf0 SHA-1: 1dc01212aab267a86581e462dcb86abaf721c6b9 SHA-256: 9b746416e655ad0f01c0d59531cab90515a6ea2e1b77fb494edf17d288e8d3f6
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to lead users to potentially harmful websites. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to manipulate search engine results or distribute traffic to various malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://elcampoeco.org/FCKeditor/file/26723483260.pdf In PDF document text
    • http://ziconiavip.com/uploadfck/file/laramebilijupo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/d8bcf945389b67ef4f5b5f8a99317718/wagibatim.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab904e6ff---xawenivaj.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/92972054062.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vewimarefugawot.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbu56dub390imon6f7vsfokmif/65010402825.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaf44dad30---rawozita.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/wigofozewatupolawa.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/lujovebojopi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8762d5df---96267725818.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608420f9af985---138091740.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/56a581680154771494d5434b3234815e/40061105413.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jiledisewabisato.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nekorasimolepiwuwo.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/rozojisolifoxezileluv.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/77508689865.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/949e6531019fb3aefe721462541e3e29/lijaxisizokinilek.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/lamepineko.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/87658185459.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9363d8442---66373265711.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/80149884563.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612381187137b---pijekuzezumadoxedaluv.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/3333930890.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/gevavadipomujapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=estudio+de+factibilidad+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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 10632 bytes
SHA-256: 0401bc46f60f0e974873917c7b7c7d81b53fc1b00e20091e51fd6e4a37aa28e1
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 19088 bytes
SHA-256: 26ea1f256ba9c1e107a644b326ff4cf89f36bbb4b3bf218f1d6401caab75db58
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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