Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b10cec5fc0b0d1c…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 16:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 008e5d80f0466cf67aa21729c813cdbd SHA-1: 29d97377418d4a3f5c18ccf6be05114746b0cd95 SHA-256: 8b10cec5fc0b0d1ca6bb8481e816a454a294434a4e159c92f8cdd4a7d1d7c612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URI heuristics and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://yanartextil.com/firma/files/65380094544.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc31279a54---funibubotefunofixutizo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609328dee3466---vipuzivezudimudapi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c705295e---puganan.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95a28c061c3a59d06083c6b08612ec7f/85014439036.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/rowozov.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/vumaxumitanojedikani.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/a56qq3nub007b3fced73d2mug2/vugufa.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/fedojeden.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/84677332069.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b0a9f5c7---miwoj.pdfIn PDF document text
    • http://vejwun.cz/images/46882477500.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/karedevopogunufexo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d73a36e5---25023504158.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/47598547465.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/93023889020.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2a1964f07---zesisaf.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607130aa97e3a---49463650959.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/xikikurobi.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/80918568348.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5to04d42ni2lkrm4opdv6de920/32085284110.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca344eef88---tulosabeg.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/caf282f44dea5bb6cf86a3a9622ecdbb/japuguzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iocl+recruitment+through+gate+2018+notification+pdfPDF 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_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 18268 bytes
SHA-256: d22ba6d58326efb307ee77efc9077e815678dc531160cb01bdf4f8388be45fad
font_02_sfnt_off00015713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15713 11452 bytes
SHA-256: 1c87bc11a45842cf47d285c0fc0a10d6276b5b5553fb8b4fa229ea18361e2e1a