Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a4b500c1437df9…

MALICIOUS

PDF

147.0 KB Created: 2021-08-13 10:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 718368c38f942a1b840911c15db3f7f8 SHA-1: ec8ec1c34bb0e8135888f037e134a540c13ca33c SHA-256: 71a4b500c1437df9b7586c6390f27a164eb258bb0b0a9b55548c24a1a964632f
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 contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the 'link farm' heuristics strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9460

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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a0e087acc3b71a2ea9e4e8df14835215/81007974634.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/52803491468.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091e07105bed---xugagubaguluvixova.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xegorovakuwogakebafo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634f50d636---nekovubomaduruwuvebil.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jitukudiwonamamalem.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/lajiwoseteb.pdfIn PDF document text
    • http://compsult.net/userfiles/file/kesoguxefada.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/92053719349.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9939c0fd23adaa53410b1009aaa9a7d/28669016236.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/kuvabumagenumosuwesita.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/72769206def245f9725b4108c6dec7f2/nosubirupu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc42bee0e5---14493513475.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608853871e272---deboludumegumi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/57029086411.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/vadujirowuzi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3c82e62c9---3148129837.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jijigufotewodavutu.pdfIn PDF document text
    • http://skomi.ru/img/files/file/xepixapiporax.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/84210395768.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/lozusabekigazasave.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5d0d39fff36f76e31e2d2dbec9efc6df/23154134866.pdfIn PDF document text
    • https://cargobull.cz/res/file/mejagizanuduwezijam.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/1112bbc6d35ed61cc8a088b5b71793ee/furuwitubuvopojaxinuz.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/25774765186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=libro+derecho+romano+marta+morineau+pdf+gratisPDF 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_off0001d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F17C 11220 bytes
SHA-256: 2b4d80e7bf698ae263bdc433fd200032cbda38252ab56b322f402dc86c4979f7
font_02_sfnt_off00020b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B25 18808 bytes
SHA-256: b359bdefc71a3bc576cfd8ed514a7ebdbf212bb225bdcbb5bfadc138a4b6bcd6

Open this report in the interactive analyzer, or submit your own file for analysis.