Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892cb2444c5c7e5…

MALICIOUS

PDF

84.6 KB Created: 2021-08-14 18:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53bde45f73346fa5704bd2ed7dfa661a SHA-1: e60d2b3237f25273deb44a923ce8e51e9442a14f SHA-256: d892cb2444c5c7e559d2c33b487dfe84dc5908d712205c2b395c6fa269be9d4e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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 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://venusland.vn/app/webroot/img/files/vatekikowobadimix.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/272420fbd705fa84c9b41fa0195a0a05/30834513475.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f747ca45---91086214897.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/ligazemadilimewolevufe.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/35744218921.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/bukij.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/japasozewoguwekeledovipep.pdfIn PDF document text
    • https://kristinanamaste.eu/files/90200934365.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lapajuduzimigudotaxamur.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4gi8efguqktl0ifoteb64aquak/57331390766.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2cbc71122834b3911c5427ff1bf6ffb0/48069266809.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/7282809879.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/e74inc9qg18f37cusjqj4a9lqv/gumikaletobapobogu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160775eaf99087---jinujif.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66a68683b---84444558405.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a686bae164cf1d62c7a7e2c02fd95dc1/17438373510.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/3600645879.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f4fa96e11---penofiluduxivom.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/hof8f62gghmu0emrv2b6oig0m7/18692310814.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/76649373678.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/75519272916.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/38517352991.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec993453624---12386183512.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608567cb08b21---buworuberasadezavuteje.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3ac968eb---73758550056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kannur+shareef+old+mappila+songs+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 16912 bytes
SHA-256: 590c113849f722c2f2520fb79729140a4dc67c2a6f34a479eff2649db9a64224
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 11024 bytes
SHA-256: c573bb3ecccaaabaa48b5494e17a33950264c1bde402aff4f1c8993f31cbb728
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40

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