Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abcf7ef0fa5d4a0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 20:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f898f49b72ec40eb49d3c0a9dfe052dc SHA-1: 6406b569e5923827f8d5ce6ef92c4f31673dac12 SHA-256: 0abcf7ef0fa5d4a0e9f258cbcb547a530f3ec76539f9bb45506bc0315a18c986
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document contains a link farm pointing to numerous domains, several of which appear to be compromised WordPress installations or hosted on disposable infrastructure. This suggests the PDF is designed to redirect users to potentially malicious sites, possibly for SEO poisoning or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ateliergermain.org/sites/default/files/file/fesesavevudog.pdf In PDF document text
    • http://ekmeta.lt/failai/file/31768403321.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/53213601279.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161336d28bfb7a---kemafef.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/fonujakiwoxa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b84c4cd058---lelojepogizokax.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/66073906084.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/tamufapajator.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/44101863926.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/123b9c89bceb8bf84725a31843f6d57b/vudasiwaz.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xamolu.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/54486571565.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10024309245.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/fewurozirugog.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zomuzigegi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a27e5623---24155998799.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/5628760926.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/levuviruvopepal.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/50160190896.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/73024621162.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e6cb59ac7b032a59fd3a2e1942a534/fodezawuxasof.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/34292432161.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/85012566160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=player+de+filmes+para+androidPDF 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_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 19428 bytes
SHA-256: 869da0ff5f51808473de63f39ee8354dd541b984f769e37d9b0f230956265921
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 10676 bytes
SHA-256: 0e974a3d00b6d8a5a82f8be230f041cf3238081a44c2081edd360968a7480656