Malicious PDF — malware analysis report

Static analysis result for SHA-256 2328c17092cded6c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-20 03:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aae60abb6cf6942cbd20d02fefc7c4d9 SHA-1: e4815324d4b67a0124fa26379250f4b606a066d1 SHA-256: 2328c17092cded6cb8db032c4b8f105566f49c72ea2d612818e474df1f9219b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090da96839e0---bujimepokipanu.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9627387344---40258240114.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00207256b---jubenasinidariwolozada.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098806d81cfb---zusajuvolesinoludanulug.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/beb12a850640050451ad902646213b4c/76128836603.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/82708614854.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/7073152640.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210802063045064.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/fru9atpo9itjlqb2lcch7hhcs7/78370472480.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d44da5273---suderupopuveme.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3363b4fd---62265732323.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sn6hfppojtegtsr9vehrakmlv0/nobeworalakotorit.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u4t3sp3uai3gfb3sjlgdb5k7o5/bamavazirodidofoxuzevupob.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/59150547823.pdfIn PDF document text
    • http://flexicourse.cz/res/file/6542094778.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e72195fb---8105132688.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/76140847872.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/rvhobk0lbpk5srgj3gke9r67io/zokud.pdfIn PDF document text
    • https://flomogroup.com/upload/files/23131995836.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/26d8i16a5bcr4j5lpnu2r7uf99/simomajex.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/rapofewajomi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/41ee79df9a6ae308b8510859b3659ac6/13119006264.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/10584378582.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/98b2b5848b00b467ade2f0653e7e3ba1/xurikudaputivifofufojojo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/43402147019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=temperamentos+transformados+tim+lahaye+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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 18864 bytes
SHA-256: 55e12c06a24d2897321fe4e0edce5d0d2f371583b30b52299d6f1fc239587ac3
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 10840 bytes
SHA-256: 7388203eb963cce29be3097240c281f90c08b9fc6f26e52179d595911a171b64