Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac2b426e7cde3fd…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 16:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3dd1a74cd219ba5825130fe4d3cb952 SHA-1: 3aba44d5eefeccc8aa1d801b6b3c221f87ac6e12 SHA-256: fac2b426e7cde3fd26f85b17b1ecbf3c0fde4f13c23334212bad298722b88b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains multiple links pointing to compromised WordPress sites and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://zespolbahamas.pl/zdjecia/file/kovexipejinezin.pdf In PDF document text
    • http://dietaltop.com/userfiles/files/wufatutisarumusuzu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/25626693181.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/telamizukirudodaxevirus.pdfIn PDF document text
    • http://web5gstore.com/Files/files/61721276199.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/rajakagakip.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/80496484571.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/23445484026.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1de7e34b---kejuvilumixujesa.pdfIn PDF document text
    • https://latework.cz/soubory/67504750762.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/46041238171.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nvurd35rql12f6e4unadg4l735/sibomewosap.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/gepetakafamomejiram.pdfIn PDF document text
    • https://banghenails.com/upload/file/lovotodoriwavobiw.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/zozopu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/68390277440.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/43669640774.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27829791306.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613244fc929e8---52678833651.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58697521195.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/49157314271.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3a2e8232---87708783336.pdfIn PDF document text
    • http://annabarons.lv/files/files/4997589313.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/18740204495.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/9046023547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=games+you+can+play+on+your+phone+with+friendsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 17904 bytes
SHA-256: 3acd76a6177be85a15089c5512fe3c1c4f4432b5f854f67ac0d8028a2f71f91f
font_01_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 14316 bytes
SHA-256: 2a0638fd6c75c9f82c9fb8fe2cce02cce15598cd3eb432d70e5110987393cde6
font_02_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 11224 bytes
SHA-256: d0baa76bc9af1cc0dbb032cb53f1aee5efe7d43d45f214f19de34354542e9f56
font_03_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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