Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dba28117a206443…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 06:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1b2590ee291ad642c63d4ba694c2f84 SHA-1: 7f63c7cb0191a3d94a85156c4aecdb33cda3eedd SHA-256: 1dba28117a2064431d2485a5afc8393cb56ad21ed2247ea2a1eb997d92ea0f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URIs and link farm indicators suggest the primary purpose is to redirect users to potentially malicious websites. No scripts were extracted from this sample, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://chcial.ru/uplcv?utm_term=define+social+structure+pdf PDF link annotation
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a9t79d0b4vg41ce9akpnkqdahs/80926414566.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0qprr824lpco1e3rmtpds8qbvc/23824859982.pdfIn PDF document text
    • https://dm288.rs/slicice/file/guginogasusabusajovisete.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003bd3d3cbf---gerag.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motozot.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/82209858149.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/i87dl0879k61c7cf5r6r70no3n/zilugubimogamixeve.pdfIn PDF document text
    • http://halanmilk.com/upload/files/kezixuwaperuka.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ca2ad4ea---koxolelimig.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/zonavixikikerupavesijuva.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/29361946925.pdfIn PDF document text
    • https://parc-hotel.info/file/89976745838.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021722137522265.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/18722702852.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27625723490.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4ac116903be247f69208aee15293d02e/mavujopajazujozonagita.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/42468046566.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba26f636e7---napapaxazudoboxaxula.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bqhaadb1lnj4g1ba09uiroc06l/14587074693.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a429cec3dd9---8682475647.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/lemoba.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff79660ae6---rubukewowisiwo.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/93424772214.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c185f22c895---44949174548.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 10712 bytes
SHA-256: 4dfb0fa2435464640abb78d6f3837f06f1036488e90096d5e1f0fff7d409e032
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 17108 bytes
SHA-256: 2eb2032559b923fc6c39ee0ce933cfaca2c1b63b75bef729eb2869005a070421
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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