Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0f05a4a6d82f62…

MALICIOUS

PDF

75.6 KB Created: 2021-06-30 16:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af33bb65b016d6193f11ec6e846d323f SHA-1: 4021b99cf220cda1e7cb9f1a3121c0e15b6318fa SHA-256: fb0f05a4a6d82f623766942548f408efcfe7d102cd1b4d0a10d69d0f00d03818
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or further exploits. The embedded URLs are the primary indicators of compromise, pointing to potentially compromised hosting environments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6226084ea---58010409960.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74469b017b1e6aaf9a8e876384fd3619/jejesevezikeden.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/45581566380.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096a08285856---vovireparixaz.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae6f337050---dabokuwuw.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/317a4984cbe867379631d14d1f8ebfb3/23455619744.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9287518d48b453892d0dda63cb224e75/45604108978.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/lifosejiwimunuxibor.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/514eec45b874285c02ff07555cff2549/vepoketigevuwidekub.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e06a062ef---mufatufurivoxitoki.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1cd9380d6993365f9c84c10c5554035b/9645271399.pdf
    • http://myjobcareer.net/userfiles/file/2021061910300773499.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a486c8d87d56bcf96a0eb5820e2cebee/84476843208.pdf
    • http://loadcell.vn/Images_upload/files/54481260574.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87287eb41---20230947105.pdf
    • https://anandamsanyal.com/userfiles/file/29602174508.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609badcfd5a99---pefaf.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf6fc6dfe---tixuminuru.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/25420799390.pdf
    • http://mlsconsulting.net/cms/files/File/juzukogoz.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3ce343e3---jafivujutazivitipipukizuf.pdf
    • https://reniuved.it/file/47426844436.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdf
    • http://laduses.nl/image/file/regukomavazidarajixivajeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+willows+at+cranbury
    • 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_off0000c4ca.bin
2792beb6c1f58228d7db8adbf90e40a2d48ceca37a791c40e6885a4e5972f4ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 16732 bytes
font_01_sfnt_off0000f067.bin
ba99ef7d3077314a119bd487fe7d24c93c120c00d6e7dfe6f9158d2ac6b8e13c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10732 bytes
font_02_sfnt_off00010926.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 16792 bytes