Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d272aa68a64cf88…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 02:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 181112a817ce60c3a643650e1b707b40 SHA-1: 5c231922422290bd4c84478d45e357f9aa3ddeeb SHA-256: 6d272aa68a64cf88b9ad311a8e6d11d2188cb232df5e8a35fcde0e16d3c8cb03
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple link farm heuristics and numerous extracted URLs, many pointing to potentially compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://serwisnawigacji.pl/userfiles/file/ponafituse.pdf In PDF document text
    • http://nprofit.hk/userfiles/jelogawovemoto.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vexubose.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/zufolefelom.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/kuzigabiwekagala.pdfIn PDF document text
    • https://masukpt1.com/contents/files/21196996579.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/25440865183.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/ligimum.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff569f6c8---zirelozerovevurodib.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/fowew.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/20584748749.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/non2njqua37e167oldbd5cap28/tafukad.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/gofojaxu.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/81102407961.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/33626877027.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/50745939096.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434592cc8ac---popefabi.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/56215402357.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cdc9abb2c4d820b570f309813bcf25fe/fukutofuxarudonubotigiza.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/tadowazulofitixuxeboniror.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zinowupuneb.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/miwiruli.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/46029290084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+being+a+developer+on+your+phone+meanPDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 11252 bytes
SHA-256: 6f2b793a4828218c47e2f16bae1a9c7805356bcecc14cb39f3928af1eff56d19
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 17396 bytes
SHA-256: e27863ec36a8792734c98f658a4f49bb8402669ecef376661feb355f4cd3c5f2

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