Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50080a9917f4bcf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 23:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5d816bbea98bd27b313317f8d404d9b3 SHA-1: eec1f434b8b9248e2e5deb454c740e00ef3ec895 SHA-256: b50080a9917f4bcf89f1e29fb17a1492ece8e46ff45828b476173cde9ba70596
124 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 WordPress sites acting as link farms. ClamAV identified the file as Pdf.Phishing.Trojan, indicating a malicious intent to lure users to potentially harmful content. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute phishing or malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85295a221a---lirijigegajikelep.pdf In PDF document text
    • https://afayl.com/userfiles/file/tilomemetekokujupuv.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wotibuzus.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb3580bd---natajepojusoxelisimejamar.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/nukux.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/vididotivipibexaguvipen.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokinemuzigopawexobawu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ae12dc2f0b1b46b23fe3bf6674cdc1fb/70974820850.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v3nq28nnr2t5kb9tbecgsli17a/vajobukakegugerepatitu.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jinulisuvavasaxatofup.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/nikafalomikudodig.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ee421b47---90340889278.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aef25a9f9---26792877309.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/fokobisenegajuxadazugatu.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/bojopagizonasawol.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc9d7697a8---sawemepojijisajoz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a5829e0519d8400b0a750546f69bba8c/79307090058.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/31374520992.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zozuvibukomuwinipumur.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/65f3194c566e9d1ec653962529b1a7d5/wukawatubejexowuwukofa.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/sajikomixeliv.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/xegeginusinik.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/zadegotunagikomowega.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8937fa480d---webufudinokasipola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=faringe+funcion+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 19272 bytes
SHA-256: 53ea4ab0c3f646516b95fa72bc0e3ec59f18dac21304fe32f24d4cf7e1f63550
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1