Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d163238cd19729c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 01:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68d7a9b074faf39939234d8f12db6cbc SHA-1: dd78d2294203edfb835913d7bbc2673d2a9fafde SHA-256: 5d163238cd19729c7edd25bc3f18a2c81a09e198b596878733b5ca7cc86d3bc3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/80858538891.pdf In PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/92148455924.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/jotaloretox.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/52643736875.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c76e9a2f---41781290521.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/sd107ne28fpus77ivlte1irrft/4957007399.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/93653717101.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/58426488854.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/08212200520.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010037176509.pdfIn PDF document text
    • http://mousike.it/img_ins/files/60331231758.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/74292033670.pdfIn PDF document text
    • http://veitali.com/upload/files/51121937293.pdfIn PDF document text
    • http://meditopthailand.com/file/93391806599.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/ruxenaduxivanok.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/68256334205.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386b0464a56---fufopiva.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49ef467da---12437618137.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/82346654020.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/xagax.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a6635d71a8536ff5448600fb01aebbda/66965399255.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5476c02f629bede4594e917eaea2def5/89899399298.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/36396558446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+quiet+place+2+online+full+moviePDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17308 bytes
SHA-256: a0c23273d7f1d701b30fb6c2897fd063a1244b730c5ddb02e577c70497cb6b00
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 10872 bytes
SHA-256: ebef5ca30523ad02c2dd9087fceb82c00f2ca9bba2f3adab6a097c06c4ffe882

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