Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5b876b3a7f2180…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 01:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c282aa12c758cbb13accacc5006655ef SHA-1: 462b88311aacda77044d1b322b5843dec9daaa93 SHA-256: 4b5b876b3a7f2180a0f6638ea08849fe58e81cb67d574cb178ac964dd585220f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aceb55b1e9e21c2eaefd9a3409656944/49597891305.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8ce24fc4---71966719803.pdf
    • https://synodradomski.pl/userfiles/file/vigulujelujeraxexozedag.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c6bba9336a37a699dcc6f439bf3b963d/78289446260.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/chol2ia5ur5adcup84cm8436dk/fudakejakir.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b1582615---34154213293.pdf
    • https://baohohoanglong.com/userfiles/file/94580280979.pdf
    • http://deeringbayrealestate.com/userfiles/files/tanefibanedixobo.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974dc40e6d4---65085738030.pdf
    • https://mcdelandes.ca/uploads/file/65052190743.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4013785298.pdf
    • http://nacyc.jp/Upload/file/68269254167.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610635a169d15---44879509895.pdf
    • http://bjdfszwy.com/filespath/files/20210808230641.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b46c1e844c3622631c5ddfea9317084d/faloma.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditaroja.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b219e5db---mekenogago.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/07127e752103a0a8f90daed07c72fc3e/34468933026.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3d44aab2f1dc17943b51a33494578723/17209467803.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6558606eb52f3db152cdb97a83d2bb0a/35060197998.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90a40ec39---56557285327.pdf
    • http://abcbyspu.net/ckfinder/images_store/files/xesodo.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cde8b93a430451b6221eb55f92486410/fepabatoranap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+house+floor+plan+pdf
    • 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_off0000d0e5.bin
fec81495ae5fe9f7fe27364b8f583bbc3a56a9204825a50815e8c2ff08556fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 18240 bytes
font_01_sfnt_off00010003.bin
a2c90ca070589129fc4a04ea72459a6e85c3553843d40ff69e0c3514cfe96f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10480 bytes
font_02_sfnt_off000117bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes