Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff49b7243fbad79…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 04:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be4b363f0f828d904a2b1f6afd84744e SHA-1: 3148071d526ff9e885a662e9e704d569e8916b7d SHA-256: 6ff49b7243fbad79c768c3bb6346eeb2e5b880934905c792c19be80c22d84018
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely using embedded JavaScript to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://foulardfotografando.it/file/24736621197.pdf In PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631581513.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161332564105ef---88974930811.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/83035579519.pdfIn PDF document text
    • http://gewald.ru/content/Files/fotopowa.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/tipozikosarelekakaxufe.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/negovamivogojukejelejap.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/37853200254.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kojorivadesifewiruj.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910065344.pdfIn PDF document text
    • http://julianina.dk/upload/file/zavamowebow.pdfIn PDF document text
    • https://sentralperdana.com/file/84646167763.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/28073276945.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/11400780404.pdfIn PDF document text
    • https://adikkedua.com/contents/files/sikesuxage.pdfIn PDF document text
    • http://lejuriste.ru/files/file/2063782737.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443b2ba80be---kunitopitukupizifuwu.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/vemogadogivamadonasulibu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/25181857660.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/pojerobemizatepegokopu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134face548ad---vikakexekefifex.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/92291663251.pdfIn PDF document text
    • http://hrudolf.com/userfiles/xevel.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/52559658133.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0cabaeda1f7ef7d36be9d921e2c74804/12596023038.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae59497a4---88913374486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+check+if+onlinePDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10220 bytes
SHA-256: 92ad88e713231a0f8ad830dea153411d048440e40d0758278f432a78448a73f8
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 17720 bytes
SHA-256: a66fd6981eab5e9254e8dbb26f73d31eed7b04abd3cc02680b3b3179c041eb8b

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