Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5094e732bffbf5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 21:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d2d6ec6af7ed81ebfce5fc0ee95086d SHA-1: c40c15ad605d978535b478eb6910823022029636 SHA-256: 6d5094e732bffbf5228f3b3b4c81916abf42be088136be93c438e31b844282ac
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to its use for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=streaming+sports+on+firestick PDF link annotation
    • http://chinatriage.com/ckfinder/userfiles/files/86996466428.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/1796557847.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1n445o56cpcf2seoaltfk5fc24/kedalivejajalubiwar.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/pevutewojozukuvalogazevaf.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/51720364894.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/18607016994.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/lifikipidogugerete.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/megikogapi.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/13798920079.pdfIn PDF document text
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tukawepunikesokawi.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/69366296285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143475165db9---99946785556.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/rasodiwunifike.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/limerazetoxebedogopo.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nufikelaj.pdfIn PDF document text
    • http://palami.by/images/file/bajuwalupezaba.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/wokuzaxo.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/59726829395.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/75302126401.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89334560836.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/rupivativowake.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/44442692467.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819b39bd63---46816071085.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vunulanekujuf.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/94d5b1c9c7488f971890c078e9b7ba1b/42173054855.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10944 bytes
SHA-256: f011bf1976a772f00c7ca59da9ababd54dd92924ab581dcad619b6036a8cafc1
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 17548 bytes
SHA-256: 20c06c59113bb1ebf1bb0c67c0b842bf94afab6c13248e262a89a5dbac214e02

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