Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d3f6bc40b33452…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 03:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2f623d6ae6ce737d9f9abd3ed4599ea SHA-1: b96281f31510d07e1d1eda1ec466d8361db50980 SHA-256: f4d3f6bc40b33452f5fcf9055bb955ab3616962b1d507e9941c68c7a86de356b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains identified as disposable or potentially compromised, suggesting a phishing or malware distribution scheme. The presence of multiple external links indicates an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ud2-140.com/files/fawegunidaf.pdf In PDF document text
    • http://100gastro.cz/soubory/files/70443623302.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zodelorelokorigazawoxiv.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/benowizugarixakaja.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/fuzagalanew.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/butuvibiratekusogufodajub.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/24823626869.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/litatejodazikosevajudel.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/28938220360.pdfIn PDF document text
    • http://salt17.com/userfiles/files/46314471773.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613623e37d989---duvizalutajelelogivad.pdfIn PDF document text
    • http://sgpeo.pl/users/file/kijoxikebov.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/45111649743.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138be884f475---dezax.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/43068264945.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427cbe4ce18---vegujufis.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/193d2beff326f078ee8230c235e1d2df/57604918819.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xogopobatabuveguf.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44939769292.pdfIn PDF document text
    • http://apicn.net/upload/files/78109725471.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/20181219203.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/vumapefosegege.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/89292311919.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/guwagevanes.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/888e2f8a1d9704475a9cb70deb710449/pujemavisinif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=piramides+humanas+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_off0000c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 18080 bytes
SHA-256: 0166dfd12e49c5c240b18a902c1f897719f12a69bd3cc49f1d3d951f1c0006fd
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 10600 bytes
SHA-256: 142045524369111c0ec871e09026edd2f5b5a5440bf8769b465dcb2c8751fa68

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