Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6111d5764534bc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36ccffa1231044b414b6f19f15f8cdca SHA-1: e58110847fb20f60c2b7e36e01c656cd82bfc82f SHA-256: eb6111d5764534bc5df66398725ebe4efd62026eb247d1016160d448dcefe581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a link farm designed to obscure the true destination. The presence of a visual download button further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis indicate a likely attempt to trick the user into downloading a secondary payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sage-chem.com/image/files/20210902_055219.pdf In PDF document text
    • http://artospace.com/pics/file/vakigokanole.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161356040774b2---dawowa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4083f2a7---nugofukofuw.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613396cbd3f15---34018464662.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/koterexeleni.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/darobetabumugamovemifupop.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lowonokulesirivab.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/luxufiweruriduxupux.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/2141565862.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6de5192d---lureropobanekawoti.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xomilevabixejikevonixafi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/ligijudipojat.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/99671452411.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e355179c9---jonujemodujejufanorof.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/50243316184.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/98286579032.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/lurumafibugen.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/52430296699.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/weselozobivolezu.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+auto+not+working+after+update+2021PDF 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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 18096 bytes
SHA-256: 4452219b59d2517eb683e60c30f725da37b9ad5c55858242e67309aa56125446
font_02_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 11012 bytes
SHA-256: 4a9861a6207d7c0c198241731baff4b47f740700d574580421584336b757bdd8

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