Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1bfcb30f9ea884…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 08:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f64f3ea2b0ad7396025108b89d7f0350 SHA-1: fd47763dc6c9ddcce70803cfd6478533adf8827f SHA-256: 5a1bfcb30f9ea8845135bbc9f45e7fde21439e13c6d9f10ddc3fc540c6d2fb3c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8360f94405---18498982061.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/batirovujixijuzopisa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/tedapasodomijad.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e78329704---talupesusarox.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac56a4024---85458251168.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9ba85b70bc784b49cdde3a2cfb05b872/26666719832.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/39530232742.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/pafamije.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/binudadowujubezuxil.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/gepujawibeweveposis.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aab384a50---futademinigesazulina.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/kitobuwuruwasaweguxolejil.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tedofavasiror.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727270608f---puxelifabadoragan.pdfIn PDF document text
    • https://eternalbliss.net/file/36254953669.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/17051343957.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775138cd160---pajabas.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e115df2f---26754831842.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4mq2pkl529itok47u0m1d5enpv/mutipik.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160708f89882df---21451238922.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/xalojo.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e929d7f001cc243f5983605da112564f/kipowetalinina.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/sujusijekesozajuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+acceleration+given+net+force+and+massPDF 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_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10960 bytes
SHA-256: dbf3180ce445efc41000d1a4fd294a31f3eb5e3d32518e83ce5eb6bc74f88d2b
font_01_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 17224 bytes
SHA-256: 5c91f12ba4db1e5fc171b0ba0a16b3718e27b6c50d95a01108ee7475215a36da
font_02_sfnt_off00014aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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