Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6efa24e25e5017…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 20:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5daf5f9032edc8450c0e8296f145133a SHA-1: 104470166c9c9085fe60682765e6abb1fcc56a80 SHA-256: 5b6efa24e25e50177bf06df89188f6406012c88d7360c5afd17219fd5153d34e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://allytemp.ru/uplcv?utm_term=predicate+in+english+grammar+pdf PDF link annotation
    • http://cardealer-space.com/js/upload/files/suferupanom.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/74810431530.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/koletimojomumoropefin.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/7623262134.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vojovirujurolubugikifibe.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/bigagulor.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/sijemav.pdfIn PDF document text
    • http://askort.pl/Upload/file/kabenoruxinefozovabemalun.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/lumaxerowixarifij.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/pidiromo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bazab.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/redutonajuvewanixotu.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/bugib.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c13fad6f6---tujibazoledu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719335e2c4---10844209777.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/31687200817.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210907_3_52_14.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/21392642958.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/51469820736.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/91794424627.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/d9e8e6da7f4e2188b58f821be2c70274/tepuxilagobebiwoxubizuj.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/54942934997.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudoxubisefafez.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/namozujusedeboseba.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6a76246b3d53618de8879d2852c04fb8/lamibarun.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/91185749623.pdfIn PDF document text
    • https://visualarchive.bg/files/norusuxerogagividemitu.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_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 17360 bytes
SHA-256: 648a164101e4579bcdb3d3cee132f6398a22f4acaeb13365eb87f81158812104
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10948 bytes
SHA-256: b1fa645fd639cec3fa49d84d573e0bf0edf0c50e3f7e96d7d8a88e0bb5dec614
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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