Malicious PDF — malware analysis report

Static analysis result for SHA-256 5588665a2e1f2b2f…

MALICIOUS

PDF

91.8 KB Created: 2021-07-01 14:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a34b355bb5cef93ae6c61e9e3729b9f5 SHA-1: 475a7b0b99ef8f09c83cd2502c28382d9081abfb SHA-256: 5588665a2e1f2b2fbde52c39c42e152086316badca881a589f8e1df999c8bda2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure itself is designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.vikingmaterials.com/img/kekamekidopoxitisebosu.pdf
    • http://aldo-ins.com/userfiles/file/28429442053.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/22p5j7ehcsrfo2a0fb8g7af7iu/zifuzumuwejezewateb.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcbc4958f---kogejoxurasafererinemo.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/313096a3c0b38601c02693a8e359f363/zejujikazaxerorosa.pdf
    • https://avonsteel.com/UserFiles/file/jepufuzofujiwis.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0b33865434bcdb50c10caf3483748b1d/72838871608.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c278acff1---60169169845.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c194fa63ee4---xuxar.pdf
    • http://ultraljud.nu/bild/files/dabifawa.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160caf4c8a6c93---69064039550.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/17c067c990e1dadda7d2ba8aa8f2055a/furetobid.pdf
    • http://gelateriacool.it/userfiles/files/29882002701.pdf
    • http://maychamsocda.vn/images/userfiles/file/22333990969.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/116f2ec3d141789e45a95ce7d8776048/16942974173.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea5cc230d---zujeraxofasiwopuposa.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qs8c3046bm03c571fbof13df7p/dosugufavigavatot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d008ec4b469---42295212939.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3031954943.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08438f19f---37557432729.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2fd5713d5fbe056c63df32be11b33562/93783583588.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/b3mi8t651ao11fd9pt7sq2i053/716440086.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b00a71a33---54122610328.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=flights+from+jfk+to+ord
    • 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_off00010409.bin
78ecbcac123bf3ecd20118be263607705d02433093b2bdefe7d6f88a692ddfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 17684 bytes
font_01_sfnt_off000131f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
font_02_sfnt_off00014a0d.bin
a330f1fcbf2f99990599c62e7bc8c329f96a1d5793430117be105a0ee8d7c112
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0D 10604 bytes