Malicious PDF — malware analysis report

Static analysis result for SHA-256 faae0a95b78e9eab…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 18:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6990c79e9948c3dd94c877274ec0986a SHA-1: a1a6b57efcc8983ef5855f9b0da902f42ffc7519 SHA-256: faae0a95b78e9eab4062b913b43b9c46d10b49626dbc5e76e309dd366cffff06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users into clicking links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=how+to+add+multiple+pdf+files+to+one+file PDF link annotation
    • http://cloverdiamond.com/file/12146088845.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/vapeganefigotikat.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/vozidipotukejebusajiwi.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac8a36f12---xizof.pdfIn PDF document text
    • https://clinicscrm.com/img/files/zabuvemu.pdfIn PDF document text
    • http://candientushinko.com/images/file/74996454348.pdfIn PDF document text
    • http://3q1p.com/upload/file/210708045449992127risrif9muhgv.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c04b29201---66421232238.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/aibettps17o77prf093863e3rj/94712513186.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/vavoximidex.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a209bbe1ea3---83536054422.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/difisovo.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/75253649556.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617020122_rw4l6f.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608260b2cbdf3---tofegarezir.pdfIn PDF document text
    • http://splogservice.ru/content/files/zajopojek.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/8245675888.pdfIn PDF document text
    • https://afayl.com/userfiles/file/61983761785.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/83526133693.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/19114704876.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/93031768805.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/jaxos.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15169807584.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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 18628 bytes
SHA-256: 7db1c9eb80a56458296b93881cf59970f048008d7e851ddf5c42ac57f23cc7d4
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10736 bytes
SHA-256: 924a3bdfdf6c7b437d393c752b38ddf031ab2c46cf81cfd3ba0eeac224a8b503
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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