Malicious PDF — malware analysis report

Static analysis result for SHA-256 464123b7faa2d3a0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 07:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c0e831bc170e570dabc8c0bde2965e3 SHA-1: 591ac157a284d533e90587e93bf3324b7d57a338 SHA-256: 464123b7faa2d3a01410ca3b1aa15a1f0aa6aa548ce570ffcc44426e82b41e8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/624c5e774f5b4394ec02444763ca632b/niponetam.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/pexevuxesenibabamazow.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/19954048299.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zejarawobaf.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/683ffe4dd036f8c545dd63dc5980f3c3/pilogoke.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeviroxaxivemawatud.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/414045068.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wopajolij.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/49337586866.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/takoredofut.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/xotusakezixizafufokegipe.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/54666482515.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/12978006911.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pobifokuzupalomabojimidon.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/dazibusefe.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/lojuzasukinudufagekis.pdfIn PDF document text
    • https://termoformat.md/img/files/23774678008.pdfIn PDF document text
    • http://insei.eu/userfiles/files/litiden.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/11027133577.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/69791760410.pdfIn PDF document text
    • http://novichiha.ru/pic/file/fogojij.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/59272774786.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/92142764e764f8498353e1a4b3c3bbcf/49549217263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=controller+mapper+for+androidPDF 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_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 10520 bytes
SHA-256: eea875b76bef3b125ad91f3ac8c1a7451c6568750f9cd7fb4d38d7407099a7ab
font_02_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 18212 bytes
SHA-256: 41be823dbbebb83d1c5967fca84a63c8b6ff18430ecf736c7f18740fb3d4c636

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