Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7552a4ca13d31f…

MALICIOUS

PDF

91.4 KB Created: 2021-07-03 01:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 85217a8d2ef6e13e71bd351fafdd535f SHA-1: 8c0130642d39dc8c231f420d2b3cf0c3b19f02a9 SHA-256: 4e7552a4ca13d31f43d324144886dd64e8a41997471a2ffff9c5d2a07bd5a74b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. While no scripts were extracted, the structure and URL analysis strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mictrogiang.com/userfiles/files/zuzobobunepetowimufozox.pdf In PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5d65cc54b8436f7b8a700cf3e7780ff2/velem.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/vagum.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/13527533948.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3dbd55e3---taromadigilipivawoka.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/dulefetow.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m45691hsegh8rd1klcbu7beeg0/72855258460.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v0rstu8nnuaku668euskqu9016/fabosakanijikenakafufo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607617397925c---3249995271.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/zerigijite.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47a3ccea27---80359194209.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3hk66ssv97750duv1su9mr3v33/bisosabimokusinefegezol.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qv8dmh3e8l1qnqk3n9gfl2lstp/belinizarewoxemaninolapoz.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984256d7016---lekelovonugon.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20c2b269a---93945282649.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076366c1cf9d---nuvodatogiginet.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0c1fe67c5a27512c553b0349104ab4a7/tiruwevigefutivivik.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088955b1cdbb---66620115256.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kt86k4jfnibp3n2dun0hdt2926/bugekosebagodom.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/75169ecf3f0ede8949fca10292e0b039/91152351109.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/nunisivese.pdfIn PDF document text
    • https://emmaushuis.org/pages/tiwakifazewexigegu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c6ea414d44b70f0a4d74cc94cd5fcafc/90728682873.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/1tjj7t2ttocsndt0lnfi8vcsoa/risalasevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=software+inventory+and+asset+management+toolsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16904 bytes
SHA-256: 69b5f99d91a5429422f973583e5d76ec82133dd39d41120c2568d6dafaa98bcf
font_01_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 11036 bytes
SHA-256: 1ae44013e37c440df3d4751b6c0ca6cfc55d0235e6ee168f2dc6535ac990a6f3
font_02_sfnt_off000147fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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