Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b921d0300e90525…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 372d01e4fb7b16b7c6deff2689beba51 SHA-1: ba8afd7440a979a4f74b27768b28bc99bcf8969d SHA-256: 4b921d0300e90525f6225dbabad2fda100cf30dd3881bf3d29e4f1942f220297
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The document also explicitly instructs the user on how to handle a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.alitec.es/js/ckfinder/userfiles/files/jedidovasixikeneseka.pdf In PDF document text
    • http://qdsenfeng.com/data/files/47161567126.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/pimofalogutotaxij.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/naruxazinewebadona.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kubarewuniwopanati.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/87907045738.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/70133707853.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/23657533279.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ae796948---40255776323.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614654c7494d8---tomelujufabixu.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/rimujuwogomaz.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/31137833331.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210912195154.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306ee767477---69260304752.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/99634256661.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/savufufis.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/8199326438.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/kuxoxom.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/97741373285.pdfIn PDF document text
    • https://sd-olimp.hr/files/zixodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alarm+clock+xtreme+lock+screenPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/95c0bb387ec97aa76f7ad6d8fd21a583/witejadegivuxexovufuxo.pdfIn PDF document text
    • 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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 17676 bytes
SHA-256: 518ff0c266d6c04e9d85b9fc9b33944c340e6973ff00d15a7b7991fb3e62cde1
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 10472 bytes
SHA-256: 61cf4191cabe5c18ebf42c4dfe0d671434ff001d732868e7ee7a6aa926dd4bb6

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