Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b79a42321324ec0…

MALICIOUS

PDF

87.4 KB Created: 2021-07-31 07:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d02553394ad31226897b386cebdb855e SHA-1: d9d24ad2d0f90bd624e7b93852ab290930dc84eb SHA-256: 2b79a42321324ec0b82b3b22df0eba624aed1310e8811b17322b1ec45f9fbcf7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bettynblue.com/upload/fck_img/20210625/file/zosuzozonolagukujijafol.pdf In PDF document text
    • https://z87992961.com/upload/files/20210727205406.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/89260581323.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/51947349615.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/87872589304.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25921d3238---33939912458.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db7fa9e0952---nesik.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9667e44bee---gefik.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/wabegixab.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413b20ead3---xozetodowavotu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ef983a34---gitasepubebodajuko.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e20ee285a8cbc133ef7aca9f5cf9c9b3/78221491071.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/n8c92dnjprkotubd2125iisfh2/81052904505.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5q8hkbvh0i4qe6evcgkqkkiph0/47133050833.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/70524547619.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/pofevudifisabaxubuxitexot.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/gitebog.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/atbr4jgb70ad2obi01rtd2d53h/61993937543.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/24416587672.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6f099ef3b---likifujiranumijowinato.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0833a6b876---88853273420.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210722_092404.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/jumamepuxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+sync+jvc+bluetooth+headphonesPDF 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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 11048 bytes
SHA-256: ffbf464ba2ac8e34baf779f67aecbc90e82d73d8cccf17bed4567ccbf79f6413
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 18024 bytes
SHA-256: 8d2505f01aad011865562206af2fc7ac4fdc6fb4c2ffa676b1b755fba1de19b7

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