Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c417da55b758f69…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 04:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 063ba352fa25cfa13b102c10f24c4215 SHA-1: da7ace1ace21f7c3bea9ec148d615d18ede2de86 SHA-256: 6c417da55b758f69404ce6fdec559e21c2d00b320c8805442326e43261f673b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://infrive.ru/uplcv?utm_term=gangstar+vegas+online+atau+offline PDF link annotation
    • https://lixtech.com.tw/ckfinder/ckfiles/files/wejifuluv.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/referutidufo.pdfIn PDF document text
    • https://tierlistei.ch/downloads/76073640938.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fitotozevozaxixuxezitijo.pdfIn PDF document text
    • https://ienter.bg/files/64294191048.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/46156169823.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/bojifup.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/93422656790.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/2121731793.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a8fb7a4d---55993021757.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142635c8b6b9---kozibawepawuve.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/66736602866.pdfIn PDF document text
    • http://rhondachem.com/d/files/7099789504.pdfIn PDF document text
    • https://penzion-palice.cz/content/dabodomuleligepufi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/15362905126.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/fogag.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/20195807047.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/97719411065.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161365445e02c3---tutirasazosadiluve.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/80803804413.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/26526881188.pdfIn PDF document text
    • https://angkagenap.com/contents/files/29235760544.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_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 10596 bytes
SHA-256: b16aa4534e0a8c2d4e54e8cfd1fdb30eb67b7a78ccff9eef9f5b7d0ddaeacb41
font_02_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 19232 bytes
SHA-256: 7494b68b432c8fe0fd88536052a51367313f4787077c0cf74363f7529398601f