Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd584ab5f4537b8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 15:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64b3944c3c041e47c9c016e3912f0bc3 SHA-1: 601a394c47b1723518c0ba0f75bfd01472361958 SHA-256: efd584ab5f4537b83638731e81a71e621aa0cb15bd6ddbdfed6ab2a2c05fceba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions for accessing a password-protected archive, a common tactic to bypass gateway security. The embedded URLs, many pointing to potentially compromised or disposable hosting, suggest a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://skulpt.in/admin/uploads/file/lidapojumobabisij.pdf In PDF document text
    • http://innotack.com/userfiles/file/febabolunenerer.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130788ea9618.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/gozobu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/rifuk.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/9035815647.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/63826562989.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210917134839.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/12723718125.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53883533682.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/sebesanezikatozulizasijux.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161350d097c4fe---segif.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wakofigotilumazokebane.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/wigirata.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/q2e4548r2b0iqrsoft89kk14kp/zufoponezadugakoposodo.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/20743162221.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/64932916802.pdfIn PDF document text
    • http://nature-revive.org/files/file/73579636738.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8f8c37dc8ccb680cfa1968f6eb278dd9/rebezepodekoboj.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109050806111047.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/17054653473.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/jirezigek.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/98421064689.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/65564979873.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb34a8b424---38129411015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=paperearn+golden+zip+lock+appPDF 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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 17840 bytes
SHA-256: 0f6688e10cfec060006d9f5b2116fdb570e3bd2d4c0906c17c83adaf375e20e8
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 10576 bytes
SHA-256: 392455e67bcbec5d68320660903c4be91dbf6630cead0d70036754ed52a5c583

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