Malicious PDF — malware analysis report

Static analysis result for SHA-256 6539ba93092098e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 05:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93c6f4772ec780a3672f0dcfd26a0557 SHA-1: d2c0a7a18517247d9112a89a60ec28db33c954f4 SHA-256: 6539ba93092098e00df178bdfcc5fadec1b4f5bd06067c0984673b8aa1b1c1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various potentially compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://streetnn.ru/data/upload/ck/files/bufapinowamo.pdf In PDF document text
    • http://vendsol.com/userfiles/file/juson.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/podegape.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xozoxewogiwubikenosof.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/setifesiwozidatoxazujitek.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/33574390201.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210614_9509F2B3BA21C31D.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/sexivugeworubuterolegale.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mpnj0pji0c2k8qkb3ahp9ba7rg/dazemolizurufetog.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/gupafefirigudulamubolot.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/28266762771.pdfIn PDF document text
    • http://erex.hu/upload/file/putete.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/vivobelubujigujosij.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/43510246059.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/28474395474.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/73e22941601afface5cfe023098cd8a4/6616027167.pdfIn PDF document text
    • http://info56.ru/userfiles/file/madavunodalu.pdfIn PDF document text
    • http://medrea.ru/upload/files/jojibuvisezifododevuno.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/fcf72a12df5cb00cf0d96ad15a0b1f96/xefosok.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/suxufekisaronevipane.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/gujovosuzifuxanemebineva.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cac1e54a---kasazulomaw.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/16261690366.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/9chsib43qche6cbhefumvvq5b5/kinexoluxutotudasu.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/rorodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=virtual+private+network+definition+pdfPDF 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 16704 bytes
SHA-256: 4109da6a0ab3aebaface6622a20896f0851a10cb22d838434e02e1d40e513f80
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10636 bytes
SHA-256: c8e2ee15992b376f91ca97da69f62d154e73c78ace34e6b9d0c97912dc00ecd4

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