Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cb4d2b8ec08972…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 13:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cca3193b9f395f6cf9572ae8f4653a4d SHA-1: dc31d13ccb520ced7a54de210d5947bbde052aa1 SHA-256: f5cb4d2b8ec0897200e03833ee04bc263029a1b722f894ec8ce3a2d4dabba0d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised content management systems. The document body is unreadable, but the presence of many links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://eyescare.vn/app/webroot/upload/ckfinder/files/tonagubabobenokix.pdf In PDF document text
    • https://iamtimeshare.com/userfiles/file/rabatedimufopadulofuz.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/lekubofeg.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiktsfmivntdibolpreamm99ok/39746152410.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/lurev.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/63b306d4a5b33cee97a91ea5fc696bae/nigugo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8439cc96a1---71212846449.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070027e1c789---juruw.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/rijinomuda.pdfIn PDF document text
    • http://demkapi.com/resimler/files/liziwogapel.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lisafugezetivesolamasovo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tevafidokaniwipevebodiga.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/8881194984.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/wazolowofiv.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b240ef85---wezomi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad5c1502b---lirudorajobujivif.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/nonipufadetavevukifizigur.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/5374030357.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/92961375763.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/nikifu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160778c931504d---gipilawoxubilikonuzepi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd690a8f3d6---pasuvodepijaxunat.pdfIn PDF document text
    • https://coil.hk/upload/files/55229162983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=betrayal+at+the+house+on+the+hill+traitor%27s+tome+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_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 11064 bytes
SHA-256: 70a140a76835a645ee471b047941460ab9ded380fa99f6e4d1a879d7f4bf569e
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 17032 bytes
SHA-256: 91155b9e3fbde06a9bc6f7e8b9582e0889458d02cb5232a9a82c054463190d1b
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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