Malicious PDF — malware analysis report

Static analysis result for SHA-256 23738a5be1095733…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 01:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4fadb28e77f75ef01e221e631837d6f SHA-1: b8683d4ca7658596acfe39b54f388f692c464cf2 SHA-256: 23738a5be10957335d0a629dcc42e5f6b8428c20b360094fd2af728e74474334
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=home+design+3d+outdoor+%26+garden+full+version+apk PDF link annotation
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/tokajamewe.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c94ce03e812873774f5bf27469cbe814/2730135048.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/36685497948.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/36360924225.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/10124861710.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/durowoxamurifamariv.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/66676314071.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136a359a647d---28816140814.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/variwikidemezap.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/fanekefegino.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/29083973029.pdfIn PDF document text
    • http://abwrva.com/uploads/files/miruwiwemaperamukoro.pdfIn PDF document text
    • http://rooptex.com/uploads/maloxeliwevulilew.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/pipasakibi.pdfIn PDF document text
    • http://zenithmetals.com/files/70668129912.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/91472314559.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/49479299735.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/risukifa.pdfIn PDF document text
    • http://7profi.net/userfiles/file/jurikibupodomoxa.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/43133126906.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3e6a266542592cb10e24c3226059ed60/lasepate.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48202040973.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a7uj7f5sfm26b1860q6m8akht3/monexobudarulezolo.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_off0000b7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 10644 bytes
SHA-256: ded425c5e513e7f76101ec523945a168df629edc57350d661503fd2acca3bf3a
font_02_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16948 bytes
SHA-256: b21cc3cac074626bda9c8b2a70bde3888c6e95224574bff9417888329c7160ca

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