Malicious PDF — malware analysis report

Static analysis result for SHA-256 6619656498ac8e41…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 08:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 985a3814b9d4ef544aaff6a4c3dc5f47 SHA-1: e6317dc1ba88589cd0967560b8cd060e0038d4c6 SHA-256: 6619656498ac8e4163c526fcf9499feb93198341b37ba3b97efb2718365b4ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file has been identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely for SEO manipulation or to host malicious payloads. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613506dac476d---25269920002.pdf In PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/76427658767.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/752f2422ff3b265651cbe76037707885/risuxoletarebavodelokopo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076be4bde7---linajikisujizuv.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/zujoriko.pdfIn PDF document text
    • http://ossokahve.com/upload/file/nepujapudesor.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ad818053---lodipalat.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/tivetomasaloforisoravowa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0a6b1fcb---73429634674.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/16004125878.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911195356-3330182927.pdfIn PDF document text
    • http://taxfreepoint.com/file/71431719040.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/64883186307.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/gawefenasirudi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosuxifuwomizawosawe.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dediro.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93465191720.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/626os6j939ecko8842acvf6n8d/68797164340.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/fulireta.pdfIn PDF document text
    • https://trieurodata.ro/images/file/minew.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/44835213029.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/jetivovedejedenewubunawul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+lite+esp+hack+for+androidPDF link annotation
    • 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 18384 bytes
SHA-256: f871f064a65537acf369e2b2a5544f13396ceaa225a3dbd094c80ee4a57158af
font_01_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001343a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343A 11232 bytes
SHA-256: 4685b5ffe4eddb5101d703193bd0999e3eee75169a5452372440e15b740d847a