Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4e8f57f1d4de31…

MALICIOUS

PDF

87.5 KB Created: 2021-07-07 00:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b97b18474cc98e4006bef39fd2800d53 SHA-1: 6998d74332279e952d3a0941b3ef129e0bc54d9e SHA-256: 2c4e8f57f1d4de314840a78a1827f99bbaaa49d36100cc63377736693cb4d442
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=php+get+directory PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9b16f24ad60ac96bc3fb237033e267eb/27543496426.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cff754b0---7930889160.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lafebukaxuxos.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf59c5399---79225117484.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5b2c5f62fe6875babf89d3328f5cb202/77688622725.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/42460372119.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vumikos.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/fb52c2eb61a6157dd5bc3d6ef5bfbab8/notonoluzaduleke.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/nejizopevetefevivufex.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/55581635695.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da612137a---fuseketedemijafita.pdfIn PDF document text
    • http://myphamasia.net/upload/files/tosonadetitoj.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bosed.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fe7ab823---xetevuworowuwog.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80623de8c9---87486656929.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/12360161202.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u71hg66bava4ftlanhesi21kt7/65194926850.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/8366072807.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/50041150883.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d518cabf796c587a2241e7815393ff58/gumakudixafegudegivo.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/xexojuzetenejinopud.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/50580014915.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/39280113559.pdfIn PDF document text
    • https://medlineplus.gov/directories/In 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_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 10428 bytes
SHA-256: 479ee457eb6d44dc2ae4890f09c768cbe914269cc1733dac7b51401a4d05700c
font_01_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 17500 bytes
SHA-256: f97928975a2c287bf97ca6b1807f62c0e27068f6a62e59fe1f5cb22db7323d1b

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