Malicious PDF — malware analysis report

Static analysis result for SHA-256 1857edcdcec63890…

MALICIOUS

PDF

175.9 KB Created: 2021-08-05 21:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0375e3d6170b657909e38ac9d1a483d2 SHA-1: 1a1893b344533425f2462bdcb5bde531583bc2dd SHA-256: 1857edcdcec63890966abb8c99d28c03b910ff18f8c56a83a97a4229f0ea66ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pacie.vn/web/uploads/files/laxixade.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91044609708.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/23023612550.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/wamiwewiwabisile.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/472b1233e6e7b798e60d7875176b346f/nezegatitarepewepinex.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/wiziw.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/26827763574.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zekagudawamezap.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cabd00ea145---55197519130.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/21351032059.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xamoxomipigavifowe.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4a7d85e3692aad5113d98342e951696/79658291141.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6db43835f29711ab8e10574b9ad8c109/lobudibitimop.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083baad331f0---miritoririsusa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10ed648e087dbfe1a2db19d6b4795525/jaretomagupusigefifiwaba.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0be8a37b7---dumama.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c12c3f67---6205911306.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16942341209.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/xadikitefifupejif.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7780c71c725a43aa0fd9fb48336fe67f/62309230396.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2a11038b82217b9322c077f1582bf3a8/simipimiberi.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/ribadevofebib.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gibagijevasota.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sotedazaweginote.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb4f5f4e5---78956770286.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1201552177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=wall-e+movie+worksheet+answer+keyPDF 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_off000247f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247F8 21460 bytes
SHA-256: 7aa63a15ca5b526458544cfbe08c7ff213be1eadd0755a11e85a26265393c785
font_01_sfnt_off00027e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29665 10756 bytes
SHA-256: d931fb04fb4cd24b7251198d0280903042559338429ba91f3db45c9f9e69fef4

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