Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d6b3bb42bda939…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 05:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 106f502a084fb900d54dbb4e7ab5a745 SHA-1: ca2504e718e68869a609bbdb67bf932f501605db SHA-256: b0d6b3bb42bda939562c6a9093312fb3b2072d083a096b571e269733e4543759
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://0924055971.com/uploads/files/202109160212024407.pdf In PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nawenadiditewate.pdfIn PDF document text
    • http://snft.ro/media/file/venafajuji.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/dugukosonisezamepag.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/sagorovewisijosabiwa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141912f94344---loguvurusevakukizusazap.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/02c8f5f5e3c67507bed8db10fc722391/riwatisupafedovutaz.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/45043699014.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/69464551488.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/56403949288.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8rndbe2shvdh2qbkq6qlfobn00/3548795040.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/14238078722.pdfIn PDF document text
    • http://sushi-belovo.ru/files/wunowenatoj.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091811321073499.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/legemunit.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/mebuviwep.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/dopiwoxalowikejes.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • http://www.bash.cl/media/file/jivegazifofurilex.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/zipabofekugaf.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tikiru.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/fujezimojefuto.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/58264867657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+reset+phone+if+screen+does+not+workPDF 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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 18020 bytes
SHA-256: 06c505d419fd38df4f0d2429b14904c0f059bec4482849c4fe949bfbca648446
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 10676 bytes
SHA-256: 500c2f71b9b87d6f63c2393c5471ef5f7c0b44d95fd8abbea7a10853a6fd3442
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1