Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd1a05409f30d63…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 10:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d225963766842d19ac97257e0c929ed7 SHA-1: 247b9f21236aa62975f5683cbad92caa19411377 SHA-256: 6dd1a05409f30d63c2de9533e2b9f3cc332201c79b60a8e87057f9eaee510fda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://vaynhanh365.net/contents/files/xadidivavaxalufomi.pdf In PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/sojotufutefapabedewexa.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/xelunupowatanoza.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/jopuba.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/tavikadasabudafunutem.pdfIn PDF document text
    • http://gibisch.info/files/files/movijepexinal.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3952380383.pdfIn PDF document text
    • https://edarky.net/data/file/71279045608.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/boxizut.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/55666770679.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/74476202382.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83738146640.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/65769860689.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde385abee---sekuxepusibob.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b6ace623079bfc9b78895f0bdd0a4f8a/pikawazutalixotunola.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d4776c2d---binapus.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/14743469885.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/84965219064.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/dujireboxub.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gemojisokasasume.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/pekon.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/24393246218.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afade26e93---41511940827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=print+pdf+to+jpgPDF 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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 10296 bytes
SHA-256: cd828674ce5607e3673989723cf403afaf75452608945778d364331b55614cce
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16592 bytes
SHA-256: 7a017af87f4b42bf47948f3ca2ebdb236cb46f2b010d3cf5fe8103137ee61637
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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