Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b050be6df09ede3…

MALICIOUS

PDF

85.0 KB Created: 2021-07-02 16:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20e24ad7f45da8708c50c58acc85729b SHA-1: 37c6bf38335f3afe0e017b0ec1fa0a655eae6426 SHA-256: 8b050be6df09ede3304cebd4d6544b863f66d550623c76a3a99e0f8e5e722d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://crewmak.ru/uplcv?utm_term=how+to+underline+something+in+html PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d86727ef---19451334990.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/68647b308fdecb685654ded4f3d91fec/zikuzemijasibiditelot.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bf6feqm201rji4fp42c830ptm/xidepazexugozujobedaf.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/84230871858.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad819a99713---35692926037.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/65631561655.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2aaf00c9---pebapeziruveridusiwoforib.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32f6d12f80fe745cecf392b66e33ac5a/60522516920.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/xexofisawi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/74180f2dc4c1b131e74923bacf2ca59d/rikasisezelixubazikeniw.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd01b4f7bb---palibaw.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/javamuzusujufufidotite.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mubidunarigizozone.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ah86dh92t80rinacmq40vumas6/zuzim.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gazoruniwevuridiri.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/aa10a3e74139d4d4e50f84b8b1905e22/97060486444.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/52b446v104jvv19bgj0h23l6oa/xaruso.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b13207db7fb---kapaparogekis.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d66984a5e---82721934082.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/28673056639.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086787f02805---70219061038.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/67a998a7519c781cacb7d3e6758e575a/56551095631.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200789834363.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1ef51864---15979103867.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/wonubozaxaxakebaravazi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/58567986341.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 17236 bytes
SHA-256: cca205be00611186b817714b74a5d12b81f8c79fb10ff70701a63fc7ceba298a
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10708 bytes
SHA-256: aa06189c9eb91989b88d1ead9cbba97bb1667267b9a9ff63ec5eb8bb759902b6
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1