Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e44010806b454…

MALICIOUS

PDF

85.5 KB Created: 2021-07-31 13:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd4289aee6a26f491d951aa8c3603144 SHA-1: b5723bfdc96458182c1f261916b7da65d43f3661 SHA-256: af7e44010806b4541103e6b351a76e350c0db6327139c60614cca8575c9b5897
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=oraci%C3%B3n+compuesta+subordinada+adverbial+temporal PDF link annotation
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841cc8329f3---kafuta.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/97303323603.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/wemejemumota.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/21611336072.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e602c7ac7db---22794072531.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/manijaloxavofukenemizaxa.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dijuxixepumovapewovexe.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb2e3ea27a---25334379127.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/49374702468.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ba03d2966318918e99f33a3c6eeacbdd/vijarenasi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4mtobc1eb21dl9pt459ub7ldlh/11230666871.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8fb430f---rimulorisuwode.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50275d817a---19852056619.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/netijukep.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/84428943415.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7adb449a62c6ee01cda34577d8b10ff7/15705177458.pdfIn PDF document text
    • http://0930actress.com/files/files/tokapivatebipan.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607433329ed2b---dozikunutaxajozela.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/xoketejisujikasisavadikor.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/8583236273.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/62469929006.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/19257423916.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c123eb6cd77---70169431280.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608174598b943---vofevufavudukifuzima.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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 11144 bytes
SHA-256: 9b4f3ec969982c8f41cfeaa328d205ac9566daec2913b52b4c2237079788e10d
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 18016 bytes
SHA-256: bb14fee57aef81430a7a65e9f76d5ff2c7c8840331da2e44da0a2b9d08785bba

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