Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d7f6d4f9b035f8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 16:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21b29bb0c420561c7735591cc2c57a04 SHA-1: b4517dcf6b2678fd55fdf581cf0e3bd0d3f185e2 SHA-256: 04d7f6d4f9b035f85d1997ae52154600a1e63d080d18e1e875d4ad7ce81db1b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the file. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lfk5734lgr5090m7n5fgvi8k1m/kumafexibasugodadolor.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/82176099.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbf458b6d8---peror.pdf
    • https://communeouchamps.fr/userfiles/file/davujegevaku.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/dojenexogar.pdf
    • http://home-plast.ru/foto/files/2718460332.pdf
    • http://rasciindia.com/firetech/ckupload/files/31427981958.pdf
    • https://ssmavidiyar.com/public/content-images/files/juvozuwokoleter.pdf
    • http://sity-luxe.ru/userfiles/file/18596576616.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3322c54496---65980649956.pdf
    • https://egca.fr/userfiles/file/99943708305.pdf
    • https://ambulatorioveterinariosismondi.eu/file/vusekejeketidodajok.pdf
    • http://year-c.com/upload_fck/file/2021-7-21/20210721080817354729.pdf
    • http://lngpetro.com/userfiles/file/63711303270.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9b3629085880f0aae8fc1d04cac09ea/54185365855.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3618ee447---88821328750.pdf
    • http://fsanaq.com/upload/file/2107090625476406278s8jvsa85lls.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5448973c---33592129462.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c73e95a97---bifijafetutexinafobar.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082477c2217f---ferekomurexujupiw.pdf
    • https://tsegypt.com/file/nubor.pdf
    • https://abzesolar.com/uploads/files/nujavaj.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080959eb823d---faxavirevezagubebi.pdf
    • https://alarrabnews.com/images/content/content/file/faxonebi.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb666019a4f774563c6949f7c089eecf/65448893022.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ea642bdc---79728808679.pdf
    • http://kursadowicz.pl/Upload/file/gefefizubowem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ending+punctuation+worksheets+for+grade+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 16792 bytes
font_01_sfnt_off0000d769.bin
f24473cdd948675d2d3fb3174e9b267b6a4c24680a9a247dfdcf23eb82f036ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 15848 bytes
font_02_sfnt_off0000fffb.bin
440e3c4a82428d22ae243621ccd1f4028895381e76b6607f981d9afc140f50e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 11284 bytes