Malicious PDF — malware analysis report

Static analysis result for SHA-256 16896c462b052ffb…

MALICIOUS

PDF

72.1 KB Created: 2021-10-01 02:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c325b8c2b07f9f4fd98cb696cb4a122 SHA-1: 69e60f3f4db4f0d9b36c10e2a5c9d7312f0c5f30 SHA-256: 16896c462b052ffb64b5bd39fb61f739f880fe89492c85268afa208b4d351360
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=tiranga+comics+pdf PDF link annotation
    • http://kfnmdg.com/upfolder/e/files/20210904190416.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/112150062985.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/23613239001.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/71163705972.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/debewojavutaweso.pdfIn PDF document text
    • http://hueide.com/upload/files/50632049692.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe4a45bd5---64374725286.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/67733063491.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/21481403370.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4p77j0hiroitbu17klpr394cjo/japinobitejazenumipex.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307703a1bd7---7864576576.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/fekesuraxafowupunizunuki.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/sofumanebajaguvivakid.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/29287288193.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202108311720143935.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/kilejezifogenejepikega.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/42449193855.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/nivitejizaruguvedodum.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mawonorapilavowure.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/futazipupem.pdfIn PDF document text
    • http://imoroz.by/upload/file/61441397985.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/fovizotajupo.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/42458003813.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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 10648 bytes
SHA-256: d08eee7ccb5106a002bcd0941a3049e78ac164543742fe7ba37532b13bd3f833
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 18260 bytes
SHA-256: e16d4350ece81edec695bcd238fa84bfbb4e183d419dd7218231cc35636f9db1
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1