Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acb5da849d2a127…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b6a78d252164d8d44881962b737df59 SHA-1: f212242b8e3d8d4351a0c3cb4b9f8770eb2e7a6a SHA-256: 2acb5da849d2a1272cf7963bafa86b87552fb24c25ab1b4f5e41dd5976001436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.minaakshimajumdar.com/fckimages/file/28966000546.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/752f7eb582eea474121cf0a98f78b04c/basemaxuxevixa.pdf
    • https://arzhosting.com/calisma2/files/uploads/63599428758.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c342ea15---vuravamakujobifufuwinelu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c142e1a5c78---jesorubin.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afccca07181---33900960481.pdf
    • http://nakajima-ya.com/upload/save_image/files/8108880057.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607291b1b9800---16978756304.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9a922a56f---3178187892.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ad4525b147aacf8527c41c9b4424a435/xesavala.pdf
    • http://novussiteyonetimi.com/uploads/file/28449452294.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160877340215cb---gekowaluliwulepune.pdf
    • http://jshtextile.com/UserFiles/file///nuvamudikavigexij.pdf
    • http://0965818789.com/CKEdit/upload/files/98850600322.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085533ce7ef9---tesobapu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49d28d084---donupimotukilemupiwow.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ddeb57474---rafupizewitelotubemijure.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/10e9c81a504e082a2560e545584e90bd/44381296157.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/85fd1b21e1902de534041c0a60cbcdf3/mevonamewevejikibulijotin.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ba014f1a4---99418182030.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b2520054255---wipixogemetisawumagemo.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0becb2b4---19594096958.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6dd1bbf8---vejimabutabujupuwavakitiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=principles+of+supply+chain+management+pdf
    • 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_off0000e821.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 16792 bytes
font_01_sfnt_off00010038.bin
3bf8344389857e69124e996f730ce89cdd691dfaba0e9692b0dd42f09c8233c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 11280 bytes
font_02_sfnt_off00011a54.bin
e7967660c7d2e237bcfb34c5911011d7da02e64ffecefa7402a6df39345256a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16760 bytes