Malicious PDF — malware analysis report

Static analysis result for SHA-256 3842c84b77e06a56…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3321ff3c4c1d3f3e9be941f34badb61 SHA-1: 3f5c1941b9d1ea032e6b127b607611b0597b6579 SHA-256: 3842c84b77e06a56ba8ee510334e7eec16715ce3dce52908631d617dbf0de564
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL analysis point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://myclubowners.com/userfiles/files/2326365924.pdf In PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/83979656246.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/pikak.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161336be4cfe0f---47126739753.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/2291846284.pdfIn PDF document text
    • http://katela.net/userData/board/file/75494022655.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5751e036af0fbb6af7cb05d32ed941a6/98443162682.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/96155666397.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/09496703dd99f6dedfe1ac1dbb77c5e6/83774226268.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/jarelubimipepufonesezen.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/68569080276.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/13214552245.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tepekebovizupujup.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/56149814909.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc07515fc---38017167307.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/momarer.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-10/20210910184411385020.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/14545460459.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/39861896544.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/39537129253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=call+free+apk+modPDF 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://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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 18656 bytes
SHA-256: 0a0fc50af5dce5f22b17a76a58c3ed2d14bd497944891c33eff018aaa2d7cf09
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10320 bytes
SHA-256: 781f3f834bf5d9c4aa18ec9c9785db8c935ff321a035999ba4d851e2394124f0
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1