Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeade82253bf70e7…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 22:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1d4a2d12da5b4d3dd0730acadc9e920 SHA-1: 70413bc0395493a86a33396ce149d835e42e2403 SHA-256: aeade82253bf70e759f4767fa2aa7de1744508adca3be52c2f72fbd91dab2369
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, with several pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jetaime-shop.dvsportbg.com/files/34114126704.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/januzasusodogoriwewakuwad.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vuref.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/13019542546.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/29492594085.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5302ab0774542a571453acc89a1e2c4c/8593422314.pdfIn PDF document text
    • http://huefpdf.org/upload/file/joguvorujoxibegobeti.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/19624102652.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/32050859208.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/71384830465.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41169296436.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/xofuzesajuzel.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/molipesariwepidunoxeni.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/1870186481.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/36992757747.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/99186447694.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/zixotab.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fedc5ccdf8---13061839271.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/96095623023.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/71248112061.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/zowasa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/4t5vqe3u4odhmta85t4drrg107/jojanowemupu.pdfIn PDF document text
    • http://parentini.it/userfiles/files/filetimitunafemaxog.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lasimigozijaw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615162a78bb62---rurajukevokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=edwards+and+penney+differential+equations+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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 15128 bytes
SHA-256: 0414a600e76bf9dde2e86dbb563a0c0f7b5a33d3939b6c91b2549002a0a3efe8
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 10920 bytes
SHA-256: 202f955fab501c9257003f4f7f45cc1dec64f29a97a83fa37840d1ad15d03acf

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