Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bea1f41cea470e7…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 01:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6c9d7070891570db8e3e00e9a75743d SHA-1: 722b5c3ed0d86680a2bf46d5de4d9fb01904767b SHA-256: 4bea1f41cea470e71b9d3d332ab10030e207edb483b6b7aee0c09add0d412b50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fablab808.com/nbloom/fckuploads/file/60915161183.pdf In PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f9d2cb5f32f33ed35db3cfce10f7ac1a/52199030187.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5df13cd3db4a68b2465b0f822e49fa93/kovofonagokaloj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebkp4o80gqh204r19m9tdmp2r6/31639832630.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/mukumosujuvep.pdfIn PDF document text
    • http://htcable.cn/d/files/tuxukefeloruzukiwipogub.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/nadisujonivaturof.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/rawusasesoxemur.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c65a5302410---96053638429.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/88087729245.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7f6e2b9b78bca49944f7aaba345b2ddc/37686989372.pdfIn PDF document text
    • http://traviet36.com/upload/files/juxudizusojolobetelovib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/264e70f07efd5e829d67dd4befd348e3/65756382849.pdfIn PDF document text
    • http://msiutilities.biz/documents/87630625200.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ed43f18053f9c78fb8262de037f8aacd/rivefafilefuweridulig.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/vatekewitis.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60f0a7244---67759983728.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c86c654f5---fopitovetitafez.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea4893d4eb---18898423322.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450444ea15---rorifubavogid.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b81164986---40447837021.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/felisovazilexozale.pdfIn PDF document text
    • http://www.heksan.com.pl/file/26955829901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=most+important+gk+questions+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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16808 bytes
SHA-256: 29a44d797cac1f52c98fb89dabf9fa19fa64df9863161df646214ff89531d0a2
font_01_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 11124 bytes
SHA-256: 43bcd4f8be4190d10d29608b3ba048a3cce83eaade451c5f5b4a95be021552c6
font_02_sfnt_off00013295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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