Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed342cbe4f8d0354…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 05:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51c02681af28b2755caf7269f8a008a7 SHA-1: 7ac1a77bcda11a925a075f9aab4d751bc5a169da SHA-256: ed342cbe4f8d0354b1a6729ee465f2130eb508f41d94be1bc00358317b49b58f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://micsys.in/userfiles/file/82582064600.pdf In PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/34123224901.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/xugatogewu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31688935745.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/ludavunifixemetozuzesabux.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/auq1kf3k4c4ufaiql5ls32oqcj/wemeriza.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/78585bfabb7348c91c6603823bebb620/nogimojoxoduta.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a11378e2d6a7493465da863f357b2f28/xofodowurunudaxur.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/22629484802.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/nowesivewomo.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-10/20210810144208721963.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/59f6d8b2a1e5e5aaea0c6c4497db6882/31767943120.pdfIn PDF document text
    • https://beaszemin.com/files/84493516034.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/fewijiz.pdfIn PDF document text
    • https://pepsima.biz/files/file/64534409642.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/xumifilujisibidatatu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee15d500a47---wavujopit.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c85bd0e976---mivuwadisexi.pdfIn PDF document text
    • http://www.emailposte.com/pictures/forunipapuvubatitesilo.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92835495932.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8h6tldvsqkorr914fu000tdvhi/kesubotakadonivejano.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b83255659---nisepevufokebabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+improvement+of+the+mind+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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10416 bytes
SHA-256: bd7562b62a7a835ff093ee4bc91748a632c6c28636095c56af1af681c362b47a
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 17804 bytes
SHA-256: 1923d8813672af4f8fb5a7f642fd74309cb9989125f61304b55fd66efbc32a8d
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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