Malicious PDF — malware analysis report

Static analysis result for SHA-256 8042cb9545209445…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a909668d960825e3b19ecd807943ec23 SHA-1: 93e6df4f3eaa647b64c9234d6de7f52745a1fb8e SHA-256: 8042cb9545209445e67caf59c1b0f015cbf2f28be8fa2351bf2fa88f6cb0b7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f309f49482---duwitiseg.pdf In PDF document text
    • http://appartenvue.net/appart/upload/images/60860550273.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/42054158582.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/67409959658.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/56809106609.pdfIn PDF document text
    • http://metallpress.ru/files/1747466977.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c41aaed20ab---69583338773.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/lulobodumexatorumali.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/gsui9d5vdvdr0j7octoeae5h16/kapipowivumaderi.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/dawixetuserine.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/34815214315.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kumoxitogeje.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/xokizuse.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/62284790246.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ccf7eea04221c3de0f9a3c64f90f7179/71127012931.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxufofa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d0f12d9514---22279279773.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/31007027716.pdfIn PDF document text
    • http://www.siposferenc.hu/html/9112082149.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/26636446165.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab1779a5a58145bfd1205745efc3c696/javamewutuduzunanujutela.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0434fc4693c1a044889cadd09887785b/buzudidijizub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=english+sentence+patterns+exercises+pdfPDF 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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10864 bytes
SHA-256: 45b7725618b1a1d7a73e046e9fc4b78d5fb50d5011b5649acf2d5b84be601f4c
font_02_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 17800 bytes
SHA-256: 0cd87f4ae55c354e7ae0b6513c5934987ce460fdf4e65ca33e2fef34301cc7a1

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