Malicious PDF — malware analysis report

Static analysis result for SHA-256 2726e9d8e525f05c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 03:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 358bdd55b9f427b9719dc1a2c761f5ed SHA-1: 77ebee6c834fc32664556016f65e1c395820065e SHA-256: 2726e9d8e525f05c796225d80fecca1bb3b0ba1dc32dbb7d654f170d9bef7dd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs or the download of further payloads.

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://laborke.ru/uplcv?utm_term=text+alert+tones+for+android PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134775036d10---10841237235.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/zonakodatabag.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/banefijisarerapejida.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kufodukumawera.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pinoxukifuwilamibaril.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/wijelenipusesiwede.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a536e18052430c2b2e8a330a90d867bf/54868837266.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/mosomategasibenuk.pdfIn PDF document text
    • http://biosite.ru/images/news/file/wewilona.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d1eb67f---39205542897.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/55856739201.pdfIn PDF document text
    • http://signauction.net/userfiles/file/78879563914.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r91k2slu7ic64aedp81qi2i9kl/88143256670.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wabedibutujit.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gosulapepita.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/07541d653fb7ae55ebe2f70e52a739ce/48012983233.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/49624322193.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/nafamoxufifajipelozol.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/nifebogonegekemipam.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/79703922235.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/27768276715.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22377503512.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/88320767490.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c60b719bae4657e73d72fe9bd3d4d007/73911137793.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fefonijeperesijebovumupi.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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10412 bytes
SHA-256: 8717d2ddcf4ee9c5d29b7ccbf7864a677d6faf6f43022dd1f739e3545bf358c4
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 17672 bytes
SHA-256: fd891b862a11aedc5df47e44f2bad43a4f2ce36fb62b34b8ca6717661853d2cd

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