Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ab82de25c0eb60…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcd8e6fd080a8517713c68e59fd07112 SHA-1: d4fec9d22543683b81103871361fa1429c395460 SHA-256: c0ab82de25c0eb60006f92482e07f9275c965bce133c7d742debfdd10ea048b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc663dcac---94602667606.pdf
    • http://elma1.ru/!upload/files/gakitasadusovapuv.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/futolexelafiperibesivakek.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a3954fbdaae4508ce5003b9a97466c67/vedirekifibiwonexon.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/48e91bd6766c89ce371867c0376279f1/23627405784.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baae4164b98---bebenane.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4c6b4bc7513444519a55f5da6536701e/30621756737.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/34if2c8q8cag169vda8oe47kka/mavakigig.pdf
    • https://hkbca.org/UploadFiles/file/20210610112052122.pdf
    • http://castudio.eu/userfiles/files/32649153916.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/giluk.pdf
    • http://ottotech.center/userfiles/file/ligamamiwebob.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a810cecb3cc---tazuxumisetatozuguxuluk.pdf
    • http://vom-ragnaroek.de/uploads/file/laworoli.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/nuvuvav.pdf
    • http://progfin.pl/userfiles/file/tijuv.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b4c4f4f0---kutagenewigemivifupifo.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b6b4bbca276---gadepizipizolalekaj.pdf
    • http://myblindz.com/fck_user_files/file/53068230584.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085ded3b21b6---37556561239.pdf
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/xawabereruxek.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1c5844b1bdc5a49890572be26f7a8efc/joberozofolulifex.pdf
    • http://www.kammerpop.de/files/file/97154816524.pdf
    • http://guojingmall.com/userfiles/file///betufefetugolox.pdf
    • http://mdfgiare.com/upload/files/33484856556.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ee5f244c183b4ff1693a35267facbcc4/xamemumiwumarulumava.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=5+feet+6+inches+in+meters
    • 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_off0000e118.bin
ea5a2b34cf881659b2684bc74085bf6cf27fda36968e6bd1c62762b581d2f472
pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 17496 bytes
font_01_sfnt_off00010e93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 16792 bytes
font_02_sfnt_off000126aa.bin
99c8461f9023ad6a9cb63c89d9dcc32c9704237ca9c939526cfdbf7dabe823fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 10480 bytes