Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87b95f61f18d9b9…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 12:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a589d2cf2395df734c61a49cf5b982e SHA-1: 94efc74b3bfac474412d106335ef4475df1415a0 SHA-256: c87b95f61f18d9b95c58f27924ba0d5e7ac418b2b735ceb69fa5e0ef38cb4e77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate PDF links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs likely serve as lures or entry points for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=write+off+mortgage+interest PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/0fb64681ae873e362f58146cfd7728b2/goseziwalorivisijozo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890419edc2c---lotewexobujuw.pdfIn PDF document text
    • http://termocity.by/pics/files/bitanozigumofu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d8803244f1deca016d1a8aadc09b7620/92379469799.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608990d901cfc---lukukivakiso.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfbaa481b---rarekepuluwowek.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/20525139033.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210628153559.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/efb28a0abd000f55a148f69803a0579a/wixurevadaxemeginipitowem.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/27641235933.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ik1k43169r40ltk1hk7fil9gne/fivikuxugokeb.pdfIn PDF document text
    • http://polletnv.be/uploads/files/gajegakixilaremazid.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7756ef0283---vatut.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b3003e382---7890517672.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13428dfc---59622622885.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160975f91a324e---65188959801.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/96892066322.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/borepavakofiv.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/vikuponipobulawisa.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dv2kdnqhg4faipn153c9n61bjt/49153719464.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160941daeefeea---98108193520.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd8c62d20---2980415335.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/xofivaju.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pssbgolo3f0089iaf2r37envh2/bugizom.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/fatif.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10504 bytes
SHA-256: b2ba9f2e99d4cfd80fac309249f45bc392bf5ba74a76d61307715c264425c2fc
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 16588 bytes
SHA-256: e9d04f5668daa53b2750ab2e21f29ba86da8d490441669eb8f0650f635a347e5
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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