Malicious PDF — malware analysis report

Static analysis result for SHA-256 c523fc344cbd353e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 08:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87a6246f6d03806640144394e21e60ba SHA-1: be9cf265d3e59a712d17390b93d8ace0c12457f2 SHA-256: c523fc344cbd353edb6eeb3ec8774c2c5fee2d71897300b0e7e4a8f174981ed0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The 'SE_MFA_LURE' heuristic specifically indicates the document is designed to harvest credentials or session tokens by mimicking multi-factor authentication prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://garglob.ru/uplcv?utm_term=movie+sharing+app+with+friends PDF link annotation
    • http://leebyenghun.com/new/upload/board/files/genulolofukujem.pdfIn PDF document text
    • http://panova-art.com/files/file/61423717904.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/legiw.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/89739729581.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/xedurawigirobikadefazobar.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/93582966380.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/66424786671.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/vafov.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/24053241761.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/53172673836.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221cdc85d5---geguturebufus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1c5235a3---vikimonuvawonodur.pdfIn PDF document text
    • https://aitalk.vn/upload/files/38139934845.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bba7f333d89533d92f2cb7dea00032b8/kemamaranoludurekovob.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/wamutef.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/77003485387.pdfIn PDF document text
    • http://freetds.net/userfiles/file/boruvisabotafulekuw.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/74415986968.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/7638741061.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/76110881665.pdfIn PDF document text
    • http://52963566.com/upload/file/202109120345541021.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/67356632231.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/99182458311.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/didasala.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/49465270020.pdfIn PDF document text
    • https://phuquiland.com/upload/files/tafenokoxegejavu.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_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 18528 bytes
SHA-256: 2a6a851942109cd7cb7d7840f7773a7028031ee364c82c0ad4bd340a86c893ae
font_01_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10876 bytes
SHA-256: 561f6ea3d734e00b07ddc8c75f138694f788ae4593116e51d9d7941810f50426
font_02_sfnt_off000136b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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