Malicious PDF — malware analysis report

Static analysis result for SHA-256 19835de202c24b26…

MALICIOUS

PDF

95.1 KB Created: 2021-07-18 17:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0e8955a7872017cc68602069b21dc944 SHA-1: 97b1e84f796eb3eacc69c0cd474538db502812c5 SHA-256: 19835de202c24b2660998650626320abd4c93bb63e7d3ae1e1516172ff1f8afa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or conduct phishing attacks. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/aae626b21aa4479789fc1b8f34cb2a8d/35539581038.pdf In PDF document text
    • https://poolpoint.be/uploads/file/35293703868.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e6e0f6dd---liwenivibimirirosi.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/85748694243.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7651ed2ddc25abd7d92861c81242e1cd/95802322023.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb235d3b25---30914187133.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc155ab68---4842373905.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03d2762acd---wefikox.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5123a2fe---96448184904.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a0f56d34---tisiwak.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/9037697676.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/93542968620.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5edcebcdb---57164198505.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/9737595378.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/32428753376.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b2b25ff7789c5ba4eb058748a2375d30/18947242348.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/39447328415.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/tolelujumepidav.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/mifadamapilufevarugopexe.pdfIn PDF document text
    • https://placute-frana-dispaco.ro/userfiles/file/sowaz.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/18940708635.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1dad7349ba0612b785d1ea9e1fe39715/vavep.pdfIn PDF document text
    • https://x-software.cz/data/file/lapodufigovigesazaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stay+out+of+my+dreamsPDF 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_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16784 bytes
SHA-256: f8808b6a9310f8d1300ab7879fa941214c22c34c46ec74f84b13a5abdcb311de
font_01_sfnt_off00013d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D70 10564 bytes
SHA-256: ab2881dfd5e0ae575196f0c957759c1bdda4d5a757fed7bdd6d66cc5a5425adb
font_02_sfnt_off000155a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1