Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc58b3b04cd065d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 10:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d34d5c907ed488d3af78dd1e7b4784cd SHA-1: de076c291272f093ee4c4e6bfc68f19a966c01ae SHA-256: 7fc58b3b04cd065d0e640e5a3253c616c65bfc198c410403548dfac60a111816
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of multiple URLs on compromised infrastructure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/836d6f41a29b71eed2c9b91157a14d7c/fojasitoravajenakoruta.pdf In PDF document text
    • https://appvid.eus/userfiles/files/risofunowafopu.pdfIn PDF document text
    • http://stylekd.ru/files/lejetudojekum.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/80188553978.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15e8b04d8---gaxegafagixesavafa.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/77618538208.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/warunakokuroxi.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/88797299233.pdfIn PDF document text
    • http://446888.top/userfiles/file/jepagakutabogag.pdfIn PDF document text
    • http://gibisch.info/files/files/44885295910.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/25844159374.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/54125547341.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/88235401477.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/seferafabib.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa08912765---99491031318.pdfIn PDF document text
    • https://ckmandarin.com/uploads/nodiwasosavif.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/dutufomofaxudip.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442c3f372e4---sixabuveru.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wenelavanuvasep.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/jovitafaka.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/55962880819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=io+dota+2PDF 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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 17128 bytes
SHA-256: 39e1d3801b14a430eb822a7e0cec0383c089fc51c950003de0c4c633dbfa7a25
font_01_sfnt_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 9672 bytes
SHA-256: b60783b3bf14c5b1f5774681c86489942f48a4edcd931d46b2a996e9c3b34f51
font_02_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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