Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c269dfdbc7f9eb2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 02:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e90bf6872343cc24ee050fea09a984af SHA-1: f43ee33cf7d75d8b9f3ad782963ef54bd5344773 SHA-256: 8c269dfdbc7f9eb2f762e3f5e0d10603f379f11f371c48b002498ad26a84a914
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://galerieportelouise.be/userfiles/files/72368440113.pdf In PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/gepopoterisajokevereki.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/losajuralorutubapow.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/watajodetix.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb6923c01---wugezirimoz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c76bcff6876b9996117ef8daa5d9201f/93508970971.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/42404239923.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/7660974790.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/92758752341.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/9667823403.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lowedotejotudoj.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/55899371415.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/31372725388.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109040544274980.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/30625357065.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/joxawoparavu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca06c13c08d6a35885e7486b8a15d0f7/logalasalofo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/uv0jteaqofetp0em7jmlr9k4t6/72871307441.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/lofasanodubov.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/47458237262.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/45408284463.pdfIn PDF document text
    • https://matricula.arendic.cl/files/luxakeruwes.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/wotine.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d6352294---bidafudapoxeti.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/jimelexipumenosafanibo.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/jojekemepeweki.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f13f9c860e072c5529774e56cbcf4511/50314496533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=3d+face+app+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zupapewaj.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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 10376 bytes
SHA-256: d2740e616c2367f698219219419531b4ee516c2b86343c17b8b632ba30e3a799
font_01_sfnt_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16416 bytes
SHA-256: c56b32ea144b2e8ae71c3473d64e0ce7d722dc014ef375919c0765b01229efcb