Malicious PDF — malware analysis report

Static analysis result for SHA-256 1649ca2cd6b830a0…

MALICIOUS

PDF

80.2 KB Created: 2021-06-24 14:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ae6e56d320c26154ba708e15673f4be SHA-1: 84393e452e02889ed9292ddd7bc45e3faae8e10f SHA-256: 1649ca2cd6b830a0a85971f8d42f2717bb687b1b6222996e469e9dadf962bc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://phuclocvienjsc.com/uploads/image/files/77550508415.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d7193490986f4880f581da987bfcf6c5/69607007569.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/874c2120cbe8a7c5c28e9fb9a8158717/lutadisidozazadisajenunex.pdfIn PDF document text
    • https://saam.vn/images/content/file/sepira.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/5999d00b0d432e3e44e00fdf225f27bd/3178007349.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1c0df941c9b047b708d00febdca4b28a/49183359107.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b049acc26a2---demerur.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/ledefijogemepusuxeko.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f086f5b4541ddf88feb2de4dd2732b8/laluwitazawipofifadudiguw.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file/%5C/votawofogi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7921b0881e15be9598465101244828dd/dobukaxotuwinifefu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fajulurufiber.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/54820551015.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302353324302.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/16445605036.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fcd872ce---85169665592.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6ce2aef6364e2fb52255c0e1a6f817cb/bovesodirizovazane.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783c85442d7---97150672431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=never+be+lied+to+again+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 7548 bytes
SHA-256: ea5db5e7e4a19b01e2def22ac72a24402a9d56ddacd90f140fda3d80396bbabd
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5200 bytes
SHA-256: 9999c5d3132c1d179a6bb91955b7af3b7f4c06f4b0af7754a89d48358468d9b8
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 15400 bytes
SHA-256: 2ade022099a9b8162e841cf7ddd3892dc4b232b60da1e81008a4c08042ac7580

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