Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1e7fda6e41fd00…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 07:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 496ec49d2cf60d9acffd1578a185a933 SHA-1: 44b5cff05084a0473bc5c7a53a8c29f2a59810d3 SHA-256: ed1e7fda6e41fd008f3c522f1de3ac2f3364f32bd6841c368c3a01e82e0d8cc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and numerous external links point towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pistant.ru/uplcv?utm_term=bin+sachivalay+clerk+book+pdf+download PDF link annotation
    • http://marthomaiticherukole.com/userfiles/file/49206084493.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/55517127735.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/34117267534.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/74ff9bdaf6bad9624e7409ef8dba5624/turikofizojiwito.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zupezikizusimodugugobes.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cab5c31f7---rijakuxajuximotevefem.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/519198c73f84bcff04853fee3ccbbca0/fovuziwovaboveb.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/xasativuvovuvekizevemut.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6nj8rs70d509dp6tirbr1c61dj/72135217772.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f0bb19b89---getotuzasugajigefokasebiz.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xeropujopabajufevomes.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/58a1a417e7c91a10badf860d34caa4b1/83329519315.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5903208c81---85723132139.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/seregobowefizafawo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8414f47ea6d3cc69342db88b71e78495/zilavazotaxarixo.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/7325138818.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160940502511ce---faxikazifokura.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/90430455594.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6ed77288413081273cadb38412e9b755/vosulekexita.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d424770605---93626558756.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/33775268182.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcfb71250---zesunuposewidimejuw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20530d23f6---dajov.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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 11168 bytes
SHA-256: a3ab14798ddfcff2b4a28c39b1c2b6044fbbdac2d771205a76b156212857c1e4
font_02_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 15744 bytes
SHA-256: 17a0dd032be105b8c46fec81cbb98ecf78450f4e26699c3675b08faaa6b53630

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