Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97d2110ca4a9da4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 02:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ae956af2067c81551d3a697ee0510a8 SHA-1: fbc8f4283c86c89cafebaf625216abbf5c089bad SHA-256: c97d2110ca4a9da4ce4f292b29d218f9b7a235928b68dd8f4dabd18889833fba
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://laborke.ru/uplcv?utm_term=livros+sobre+veganismo+pdf PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c72658d301---98586860504.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/lusodonufusup.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f596cdc8c1---munak.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/914dc51ea641e9a4b800898a29127c2e/wokadifufiwavubunodudi.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892eb7302cf---rawuvenuruwebojadev.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/45417795508.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/sezujofopudem.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u26hlgnubb9niqrgjhjiub9et2/pokuwiritodavogaxi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c41aaededf12e1d43d0fb12799fec718/finuxozinagepivora.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/movimi.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/pilupubonoxoxeta.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/65596582604.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/2613949391.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/dujeromalopanapeb.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/82482320936.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/78375712757.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/gabepagazuzesekixi.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/gevinizamiwupajerisira.pdfIn PDF document text
    • http://ipublicity.cz/data/file/39980877213.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/4741776294.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/kokilalorenididarukofi.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/17396396552.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bdd3e8d7bb2cf48d9fe8a2ee6b8b2905/71430093625.pdfIn PDF document text
    • 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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 10860 bytes
SHA-256: b551f7b99d577510dabbb44174aa8e501ace8f96f26961c30d048f3d966cba7a
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 19884 bytes
SHA-256: 1f5a654af14f21674189f560aa9da2ee0b4a5f70ee6dcee965ce01e2222e9003
font_02_sfnt_off00012cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1