Malicious PDF — malware analysis report

Static analysis result for SHA-256 352704746afc0db6…

MALICIOUS

PDF

78.0 KB Created: 2021-06-27 14:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac1b75d202e27c44f989ea72e078f09 SHA-1: 47af76e5d6fe5d7d87c6c78627552dc8b0b5bdef SHA-256: 352704746afc0db6602d78f4417f4585531d6cb9abe3a4092343f92aa1678ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites and disposable hosting, likely to distribute further malicious content or manipulate search engine results. No scripts were extracted from this sample, but the embedded URLs suggest a distribution mechanism.

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f27b9a4065d7e834654bfd4a4a38b936/sogutes.pdf
    • https://noihoithanhtuan.com/media/ftp/file/10518217350.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcac8da10---69024465992.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/83551424588.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/he4a51crucqv3vnep9rvvg3q30/sogumagumoxuwasukosoxebu.pdf
    • https://airflow-skateboards.com/upload/file/96630676915.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/10b2a029a14b8caea201373b9623cd39/27762795642.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b68aae9c4e5---fejelitejug.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d780d38e3e---12104387992.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c361c9bb028c9bc9c37a378cb4e8f9d3/93734353391.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/29f26e57f8073f1007a380e0bfd83f9e/zonilosutifos.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c900ccb134a---11421580643.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hm3gv4j8m8sr2uf6d1vri8eph6/vamiza.pdf
    • http://dioceseofniranam.org/userfiles/file/28328952369.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1jovpi4q2isoau5r5482rkldej/tesuturozopagiliriso.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fb6519e4---rejubuz.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bc267ec1b68bce726d7678e8780e5310/16369310910.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e3c8cfd1f6fdcddd7ab34df8767ebadc/48315567860.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p9h1anv0l0m7cvkjaa6pu9ciko/4774430766.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd56c146da---27401235999.pdf
    • http://danieldesignpro.com/userfiles/xuruxawikefagejamojusus.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/bizapunisetibarigu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67cf0f95d---56241598117.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0937505669---4401726671.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=scale+drawing+activity+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_off0000cfbf.bin
a5197cbb906b307d56278428396341abfb2e35c5108ac407e794a96fb9041f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 16168 bytes
font_01_sfnt_off0000f9ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
font_02_sfnt_off000111d1.bin
0bd968e174acad9af975a63eaf65c5e75f23cf9ed4a0140b46b8d9a5334cd751
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 10848 bytes