Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bcfb78b3054ed7…

MALICIOUS

PDF

105.6 KB Created: 2021-09-01 02:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab38d200181551bf35dee9940a7d684a SHA-1: 58981fa3f62820d789107ad03449ad1b8dd220d1 SHA-256: c2bcfb78b3054ed77bc60ca4add0b2f49507bb61597498c0649bd95210b170a4
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and heuristics identified the PDF as a link farm pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/84736623906.pdf In PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/puzila.pdfIn PDF document text
    • http://jar-ted.pl/file/56648413281.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984ba3a8f71---vudaxekofafib.pdfIn PDF document text
    • http://peoplefoster.com/pliki/xobanalebezowokojeb.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa3a362fd---xuxapu.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/14213647869.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/62500608839.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161211a2fd5eb5---67229961849.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/23c65b2764e1fce95ad7692bef4efa31/jepazogodurozolim.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/95ab57f8640f3356aee750992f6b8924/99097362821.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dc3204f1---3951696180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f907bbcd---38002359069.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/suder.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4550099500.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/47026189812.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3d6jmcsl9ldnta6thq2g19pvcl/xejigisanipeduna.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/figufigunulanapamu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ed13891d---40152939372.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e0b036d4---99570714492.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/19477672348.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/65007800342.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5aa81ad86---rozotefixegud.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gibijileliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=match+the+phrasal+verbs+with+their+correct+definitionsPDF 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_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 11004 bytes
SHA-256: 0c264196da2cb5f43c716a4eaaac0b1305d3098de7f0e4d8817df9df17e6d9c8
font_02_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 19448 bytes
SHA-256: 14fd1b497a0afede93466019868af98ac73fc2e241081aee316f4dc04ea023a9