Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6666a32010f32…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 00:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69d94c20ad77ad2e3d447c90177025a6 SHA-1: 0f5d9d98e6e4e02eefe78159004f422d719440d0 SHA-256: d1a6666a32010f324b3d3ff454541be56022c7907a4a79eedd3a4098342e3b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=reward+robux+earn+free+robux PDF link annotation
    • https://kitapkapla.com/upload/ckfinder/files/63234356482.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lanunatubibaz.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109061408245645.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tarufajojilifitofikufa.pdfIn PDF document text
    • http://sartor.ru/upload/files/lozogolafitokusi.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/81423680213.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109150300165987.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/kudamufizekejojabop.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/guvelofuxakesi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eadfdb4f9---89691716743.pdfIn PDF document text
    • https://clubon.top/uploads/files/romifubotarovis.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/duvitosatanesarozezomini.pdfIn PDF document text
    • http://makaroma.fr/upload/file/kanikesav.pdfIn PDF document text
    • https://geloracinta.com/contents/files/nunegavi.pdfIn PDF document text
    • http://budropol.de/Upload/file/72157842825.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/tipuguninilafufumegaxod.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39d849f94---pumorixolepogafifivek.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/76617019553.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce29aa6d2---45062147520.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/volaxumuruniro.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/rosikilonofizadixiwul.pdfIn PDF document text
    • http://topp.pl/_topp/file/begilusoka.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d790ef1844---50705636948.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 17128 bytes
SHA-256: 09e07e39ef0af522e9d7e20dfcb18258fea945e34ce398c5afcaa7180b4e82a5
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10416 bytes
SHA-256: 0b5b83f78d6d5d374ba5aed46fc7a212e11e86e76717735c34c5de4854940be0
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1