Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d48521a42a96695…

MALICIOUS

PDF

82.7 KB Created: 2021-08-23 09:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a6d310b48761016dc7930b7922d1f1 SHA-1: b464f0ebf596814e91d63c1df300129331a0d113 SHA-256: 6d48521a42a966951345e8748315a8d00027ed4321eac63b65e4d8179edcb893
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The sample functions as a link farm, directing users to various external websites, some of which are hosted on compromised CMS uploads or disposable hosting. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.yemany.com/yemfiles/files/nipinolisena.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119a863e4ce3---zuvutizafo.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df26f6d3688---lufotukenokon.pdf
    • https://kingcarmotorista.net/uploads/files/turexola.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/tarunidevolavak.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c457be2d---87246519825.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/vizuz.pdf
    • http://dalaichau.com/files/zikanubajimeliwoluzawi.pdf
    • https://motodubai.com/uploaded_images/files/toxet.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdc72df3d---61391555931.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210601141515.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a94db802779---43887594677.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/48984fd92ae62dfb0c5f499781410365/79218202397.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/693ceee53b07c278b92cda59f4e7cd19/zujirumumirisem.pdf
    • http://flambotour.it/themes/userfiles//files/favanoto.pdf
    • http://nhadatv.com/webroot/img/files/fezajesobovibekuwitiv.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/285c06fdfb6163016fa19c86e962720b/39253906843.pdf
    • http://1975geegees.com/clients/78603/File/pupatarugezasoz.pdf
    • https://tortugafilms.ca/adminfiles/file/wupipuxabibago.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90467adf6---97391179250.pdf
    • http://kfnmdg.com/upfolder/e/files/20210602160302.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1411qna9jlo0olkh5tr9ch52oe/89689955184.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mx+player+pro+version+free+download
    • 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_off0000dda2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
font_01_sfnt_off0000f5b4.bin
a37f32c5ed58338d443b1640b4df75c963e0459621fd563cfe91e798a38a717b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 17732 bytes
font_02_sfnt_off000123b2.bin
9cc27b80d8cf814c73210bc91ae9b16a628e0306fe3a1bff9a62c1a5f1645046
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 10756 bytes