Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ade3db080f9e1a9…

MALICIOUS

PDF

111.8 KB Created: 2021-06-29 02:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05f951bb42690db8de01d24563017821 SHA-1: 8a9f68defb85d30d71e183317c64b4da861dc754 SHA-256: 5ade3db080f9e1a9771fdbadb77d33c0ddc10d8841ad2b28bdbded441567078e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations and other disposable hosting. These links are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://nomylo.ru/uplcv?utm_term=flying+car+drawing+easy PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/in2qe582p0mt2tkakoovl75ef4/82775735499.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e72e8ab8---42658741472.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091481d6bb64---15375383360.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e0d236fb5e662cd87f4dce941a0a5b2d/77377731500.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/kewibalabaludeza.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8263372179---nofigino.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c21024a0579---520674147.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7s8ff1r30kc88ch0s83q0bvqer/40557468466.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/84091631917.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/66629786746.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6318cfc0f123166462865bbbee35d20a/52627763369.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/78188819309.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d7d3e19d9---63217960257.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8plk9i09filkic8na10lqi6tag/26667077186.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fesitamuxijiguwubi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210525045305_2117953865.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4461198e9d0e7890bd6f47ebdaf12de6/68093939078.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/64066552028.pdfIn PDF document text
    • http://newo.ru/files/files/bewumun.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/4890663024.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/q8m5153ah50hdac5u93207iva1/53964783406.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8685795dc5---xelazuxubuj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 16248 bytes
SHA-256: 6c7e1b754cf38ee70ad76cb780c90d71dc4ff6fc3e14eab78a91c98fc4406452
font_01_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001693d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693D 18616 bytes
SHA-256: 3be1b9df7cf7f3853bb42443b18241825e5dc1bba555f521bb3e1bce18065e61
font_03_sfnt_off0001999f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999F 10504 bytes
SHA-256: 79023c4b3ed79584accb930179a5160f7bf9d05b4a5ddb7fe9ceab63603549d9

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