Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca3563d035f1ca…

MALICIOUS

PDF

93.9 KB Created: 2021-09-14 05:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a63bd5cdc693b352dbb4fc40a7970b37 SHA-1: cf136b9f71873cbb004cd3859b615e9487061f9c SHA-256: 25ca3563d035f1ca3c7fc133a1182a4342ecefcff638d8e62b0ed272b8205af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2293ac17---97077694070.pdf In PDF document text
    • http://fourfoods.com/images/files/lufelagiremomin.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dewazobevufajenobumo.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/40974132787.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wefobazi.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091306220173499.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lubuvepus.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/81087973468.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/22244258856.pdfIn PDF document text
    • http://identik.hu/editor_up/18355451292.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/84800999380.pdfIn PDF document text
    • https://flyags.com/editorResources/file///luvabizo.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53102082234.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021910336516434.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9btug80ufocqpjav1ascrd5m53/77785892797.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/4423612227.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gibumexo.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/vusefuzivobugafexawel.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e294ecc9eb---jujogubotu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9941a40b3---902164919.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/45634171436.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/putolowexigov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=words+starting+with+o+with+meaningPDF 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_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 17780 bytes
SHA-256: a5ae84566b83b7caa8d0233736955a324542fc4d24c5b0b6378b8866dd9fe00c
font_01_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15150 10728 bytes
SHA-256: c670d1cfd69dbef48628248ab312abab59372200fcb02f43d8b30231c2072ce7

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