Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806e17cc54636d1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 10:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4bc42c142ae4686666f2fcd94006723 SHA-1: b06a874f49bfe81301bc0094736b5c1b19d63b63 SHA-256: 9806e17cc54636d134b342fb88887253cb1aa4a5340a9731cee3a3e8f9416ff5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest this PDF is a phishing or malware distribution vehicle. The primary attack pattern involves luring users through a seemingly legitimate document to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://cructi.ru/uplcv?utm_term=wso2+ei+documentation+pdf PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547eb095ac---61524029775.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/pufapesubaka.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b7f83b0eace49c57b2d35c8a87e241e7/fomalawafivotemakabodegaz.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e9ccc92054374f516bd672853baede25/matosufafegozukibid.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/cb7ee76a15d3c175d9c81ad514c27e1d/pukujud.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nasuwepumazawo.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/73437518905.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/21284387024.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/31d1b4c7acdebad465dc82a84a7be311/43090661978.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/wuwizorobapuvirubuku.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8lb9tov1t3pupcnb9dd706590i/birupafafewasofuvofilan.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/goxepejesemajibulol.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/71532676795.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210718182839634.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bpg6epp9j5ujm3qp9d983o6jhk/95631992374.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/waguxijodazavolelom.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d29b8538833121ffbcf131d1bb1e0a04/55733971204.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/78014840244.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877c2f7e807---bapirawewoxezakemorajemi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd2648e3d---mevubowoza.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kixukiwawojisipigil.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/24c198c1d38722fd819ceed07c38f4fb/xolokewobevava.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10848 bytes
SHA-256: d70dc1213bc4ff608401406d8c61bee62f04c0f618a655826989f835d38ea2bf
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10679 18264 bytes
SHA-256: 92e6ee265019ce64a9f79a9ae6d58c785e5248831cf55f243efe997c16b74318

Open this report in the interactive analyzer, or submit your own file for analysis.