Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3b3271bf131338…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 16:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93db76c09c4a178ed3893a7da91f561f SHA-1: acf28dc36382cda422884f11cd7bbced885262ef SHA-256: 1d3b3271bf13133829563778230aaa5bb11a55f15cf9ad9ce65970805ca5e776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=predictive+analytics+in+hr+pdf PDF link annotation
    • https://egyseg.eu/ckfinder/userfiles/files/50064209157.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d90a2724672c2359365a18b3b2b4da0d/namidamesasopixugumadiwid.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/rabexixawizujejepujufus.pdfIn PDF document text
    • http://special-pharma.com/upload/files/fatemizerekojedam.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/65688411206.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/supimulirivebinu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/genalugivikogubudowomi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e74b80ad4---28291039953.pdfIn PDF document text
    • https://fototipia.hu/files/files/nufamuwowebugexusus.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/9065379778.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/wulusorurezobalotibuxu.pdfIn PDF document text
    • http://kaies.net/upfiles/210907005719028091peps9x.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/xiwawidilumagadonagutage.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nisebosugusetamijori.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zovetebirofasuzetilawova.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k2m5baphpvv0g3cgg2glkcj4vd/dezinelomigitapasifetuv.pdfIn PDF document text
    • http://dges.in/userfiles/file/zuganatok.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/26269145314.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/86845515660.pdfIn PDF document text
    • https://luminex.pl/upload/file/54638769275.pdfIn PDF document text
    • http://yejida.com/userfiles/file/91838641471.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/dikapunosoval.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/32177119592.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/bivojolazaborilorasatover.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/36938531083.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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 10780 bytes
SHA-256: c15ba5566a435dbacbafaffa976563f03815bace0427bd47cf07fc7109826c57
font_02_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 14500 bytes
SHA-256: e7ee37a417042fe477c05adf9e4ca197917c26d9a9ac237bb93ea66de3a21466

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