Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e81ef6e8f0df0a6…

MALICIOUS

PDF

78.0 KB Created: 2021-10-13 00:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2bf06e9756d5a994385c7205dc1bdc83 SHA-1: 07ae57e3efc113191c8a237db306ee0e149f91bf SHA-256: 9e81ef6e8f0df0a6ea2cf8c3102a64d6114301f0e1cfc5fa6200c02fd8f1e5db
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The file's structure and embedded links are consistent with a malicious document designed to lure victims into clicking on compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://xistenze.nagydavid.com/files/files/46993633252.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/43928475238.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161622fd1365c6---69775122181.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cf8477495cb13b41d8b46e180cf1699c/65966979952.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/giduwinokibo.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/65819221462.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/24723418625.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70b0ccc0---81679680559.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/81217231144.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/rotoselekojusolamexatot.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/bufunijapusuvetu.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/rigutenalefawemenaligox.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sitususuxut.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/80412449594.pdfIn PDF document text
    • http://topstec.com/d/files/jifiwosozizosemovojixam.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/56091349221.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149b93844a55---kemuzerigagagulalusotitaz.pdfIn PDF document text
    • https://primer-spb.ru/files/files/suparekaminafaxet.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109112130293982.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/69434619539.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/58830913471.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=bowen+1953+social+responsibilities+of+the+businessmanPDF 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_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 18000 bytes
SHA-256: 5968542b976ba4d1a32be41993487d34b5ef569f2b0700fa368924e4eabb8a4f
font_02_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 11652 bytes
SHA-256: 49d2672e1049f7c3c523c4062d3eaf7273b128ef310bf258ae3dae15d7a4066c

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