Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa77ffb5a7a2cc1c…

MALICIOUS

PDF

143.9 KB Created: 2021-07-02 23:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dffe8780d6f7a9dbe7e1652a125ff40 SHA-1: 5965347d5e1a7d0c4a7617f6dbc82b0fb577c36d SHA-256: fa77ffb5a7a2cc1c67074bc8c286cd5c896dfdb0f873ff0688726ad39b8820c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crysiq.ru/uplcv?utm_term=turbot+king+of+the+sea PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1952b033---2913438957.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/45114652700.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/38373812518.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72de529e98e60538e1210eed4a156580/rovapelibobimafokor.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979491e41b---63141770753.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8eade05ed3c0162957861716d885b028/9620734085.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/50410192410.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0e01d66b---sitegoxupamapele.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7a76b390---buwubavirerinopawunop.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9861b4fc8---xazufij.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070148cba09c---varolatefoneza.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/42459197523.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/54114456973.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595fd29a09---35863511165.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/57d11b11deb13b4362c3832208cb4aec/muteraso.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/11247232061.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9834013435---siguvuxafawumamexepemudus.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dcfd6ba91---devipilipexesabolawurawa.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/98613046728.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0500cf242d---vuxizanogar.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ee2b7857dcf71319808d255eff914948/selipozekiwula.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff795daa2b---sujujub.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b272f0e78---fupudajefatag.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_off0001beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D705 10740 bytes
SHA-256: e53b3710f62db5c90348d61727f1857a4002f4770115143a5b370ea951d36412
font_02_sfnt_off0001efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFB2 28056 bytes
SHA-256: 88a826bf8214686d725b4ddf6989990bbc349a71a3ee30b8b8558d98568a8490

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