Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86e0d1fe561327a…

MALICIOUS

PDF

96.9 KB Created: 2021-06-28 02:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4d0a84cf51573492eb534daf04283ec SHA-1: 9b8b5cb0e68463126aa9c2ad2f5671230ac8331e SHA-256: b86e0d1fe561327a31d87fbef7b1a98f531022ec8c03af64dae63034b39386ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file acts as a link farm, likely to facilitate phishing attacks or distribute further malware by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mediaworld.pro/ckfinder/userfiles/files/mipiwosudorariguxa.pdf
    • http://arunimaflavours.com/userfiles/file/96520817761.pdf
    • https://daynexweb.com/upload/ckfinder/files/51509914059.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40970ef44---77841901799.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf033e65ecf---nopipuvolozupegowegema.pdf
    • http://terezmisszio.eu/files/file/xarax.pdf
    • http://feynburg-uhren.de/uploads/tobelejifijaletib.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7qib346cf8kec80og6sj27nofb/pasupijil.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651ca5f5b7---98018654191.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f6e47605---dositozef.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2d5a1c4f---67225356354.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7c96e6e3f8de6212ee88707681444784/53608628953.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/51e93ddffdca283b6c55fb529a61a9a2/14957691614.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2416c0c52---zawanodigik.pdf
    • https://notrepanierbio.ch/userfiles/file/17334801510.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ts0cbctc89ldcq8ojbcpft805t/24521680855.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/dab316f4abb98da2dfa2b9a08f94711f/nebabomavaxenofigo.pdf
    • https://zold-kommando.hu/files/89246814972.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6e3f3a143d75dff4cd7d059835ab66da/burufaxulixupaluxosuk.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8acda62b7---mubimo.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9coetolk1os3336q1q13ldijp/22105815229.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/38665359030.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/km1u9akfb88l4e41jf7mkogc2v/32995983190.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a92eac6c---45278224798.pdf
    • https://arrayamed.com/userfiles/file/32564563882.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mid+glute+exercises
    • 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_off00011a4d.bin
ff76a634eda259f42055f08107f6329962d1d7c970dbaa5e161d37a7ed2d6128
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 16664 bytes
font_01_sfnt_off0001457b.bin
45764b80c08109e5a6842fa3540d94f8eda13e2b439ebdd2354385d74069d0be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1457B 10356 bytes
font_02_sfnt_off00015ccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCD 16792 bytes