Malicious PDF — malware analysis report

Static analysis result for SHA-256 6103f76ecc67ac46…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 16:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed620986ecd258777990d2ae159bdec5 SHA-1: 26e9a3bfd4e074787c4144a7bfa76452de5499f7 SHA-256: 6103f76ecc67ac4643279d1bc53cfa38ff0af982d772c5846d19959128333d3e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to malicious content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://oio.cn/uploadfiles/files/76233222061.pdf In PDF document text
    • http://augustaelectricalwork.com/editorData/file/86869923206.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/lutejora.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/datukuverowinovorirebo.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/72874519479.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1hdqud56tsa0ci5v8omp11h6ep/tudotekamoramofam.pdfIn PDF document text
    • http://hidropro.hu/upload/3163210509.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/desedawijugujituro.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63093a33a---nepojuwojijixavujuz.pdfIn PDF document text
    • https://ms01bet.com/contents/files/neridufapo.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/tibipexukinuwo.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nawizubaxunilal.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rotaxawutivorafewipug.pdfIn PDF document text
    • https://bolahijau.com/contents/files/pabexujutifakoto.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614130d7b0506---gibekesuxujozudive.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/xasotifew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e93c932f57389a1ea44a44dc4f0b9a6/xadipegulas.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/84505562682.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jusokaxuxe.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/55442437301.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/susoluseworunakaxusol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mod+dragons+rise+of+berkPDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 17456 bytes
SHA-256: ae3b9468a23a4561eeee4478ee69f614c4c6cf41bddc0b974afaddc290f38024
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 10608 bytes
SHA-256: a13c789e7bc7f2a71a0873cc3aecf88acfb5d317e184975539ac0f49469ceb04

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