Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a4c2405909151…

MALICIOUS

PDF

83.2 KB Created: 2021-06-29 03:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d775209c95f8d8c4dc197f14aeed61d SHA-1: 489ef71a4e10a6f267afc10742c863e3c6320b28 SHA-256: 8a7a4c24059091516933ce21ebde682f20fb47051354aa5f7ad7d3c10ae6e89a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The presence of external URIs and compromised CMS upload links indicates a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://wastran.ru/uplcv?utm_term=dst+all+food+recipes PDF link annotation
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160703a7b50ed7---voxijetiwudagen.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/51332823942.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/ferilalubegorejodogumuse.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/99488345653.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a202b862---43597582523.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7856773d3---95600766163.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8ddc7cbb42be9ecca034d14bf2c17bd/biguve.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/it5n2sd5hscluquvca5nr9v397/13415568947.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160be4781b59a7---61939874901.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4qtsu1qdh7t03su5bgmoacm4rg/dumubuju.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/jlroar8k5c9vcdk08gr4bgqpio/gojufin.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebceae2480---14152001258.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/lelutijexesoberuxu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85e9897e5---lodowizoxememevil.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/43c7dca3899d81f3a300e19e0b15d2d5/62313645593.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bajigosaromeloz.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/42957509383.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/35408031182.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/fudukupusagelakopodizize.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/72901164904.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/5854740023.pdfIn PDF document text
    • http://seamacros.com/upload/file/lumazitiponabetuzi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1a23395a---29481492284.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7a3c23c613e5f7b144fba11e067ba152/31157858047.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/0c75a6b5f40fdbc3a3ff36fc142fa2fd/kosuzitamigemas.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7qvg8sc500ro6l8demfrlhdadj/bumalugemefadisowajolobo.pdfIn PDF document text
    • 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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 10508 bytes
SHA-256: ef70cf5ce22a901561947468fd7875b488851dec1614b8a55619632e82a7e9c7
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16972 bytes
SHA-256: 4c1f59fdf516f5df540c52648567f90c435f38eee686d2005c57b152404e174e
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1