Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8c07ca7df32a7d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 11:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c41be7ae9a0da72e9b493d33ab7be76a SHA-1: 19276b4e5ccd7a0f070fc8ea21c44a4e6bc8c58b SHA-256: 5a8c07ca7df32a7d226f90ca766118fe1db25fd1682cd382e93e3d0ed33de361
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress upload directories. This suggests an attempt to lure users to potentially malicious content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4483

Heuristics 5

  • 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
  • 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://smartcevent.com/clients/871459/File/kiwonemapusejudaxuxi.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/26d186033fcf36feb8a1cf8db7ff8d5b/32141596467.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078539da98ca---1345290558.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425f219952---48024679820.pdf
    • http://www.tomasjelinek.com/img/pub/file/86780383239.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b19978a33---dixofopokobon.pdf
    • https://birotex.rs/images/files/26546709770.pdf
    • http://orthodoxnews.us/file/11959795265.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd69da606---buwofidexukapiduxobame.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449612141a---taxizezofupude.pdf
    • https://reparation-mobile.net/userfiles/file/jilexagekit.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9tbgncimgpmhh2keenlvvuhao4/82733699464.pdf
    • http://neodentpetrosino.it/userfiles/files/22486679134.pdf
    • https://hobbes-group.com/upload/files/72202998431.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/52902808465.pdf
    • http://www.peretprod.ro/content-images/file/jividar.pdf
    • http://ciaooo.ru/uploades/userfiles/file/ziwuxigifawo.pdf
    • https://sgotomotiv.org/upload/files/kolakemisiret.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f54c03fc2a---1475095919.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da20ece3a0---62878841631.pdf
    • http://yongqingtech.com/d/files/25982197829.pdf
    • http://air-ned.com/uploads/files/lagalabegadivewas.pdf
    • https://ringid.vn/ckfinder/userfiles/files/2567704705.pdf
    • http://maximaviajes.com/FCKfiles/file/larikikebapujosage.pdf
    • http://reopen911.info/media/file/wusejo.pdf
    • http://au-zlato.sk/upload/files/todegin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=navien+240a+tankless+water+heater+installation+manual
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb02.bin
d12b7c552db141ddac33f7d7be1b647cccdef5b7e204fa3be1ccb8eabaf737bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 17672 bytes
font_01_sfnt_off000118ae.bin
1f5de7412d7c8c908cf17971a2268627beaa21d1c84f3f83f783157c88a73f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 11012 bytes

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