Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea57e3becaf6950…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 06:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e5db4d59a0c69e281f636c66ffbe759 SHA-1: d3c9972a804267075ab75f38c86cddb5e7ef5eb6 SHA-256: aea57e3becaf69509e85cfacbbfb8edf2bde0dffee152de0c88ad21decc36174
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF files hosted on various domains points to a campaign distributing further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0775d2a93b2953b73defb930ed9fbfcb/56378542691.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/dozenubebuxuzef.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/7381728510.pdfIn PDF document text
    • http://lulanjina.net/upload/files/banuvonodogefifa.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/nifepovunoluraj.pdfIn PDF document text
    • https://thehouseproduction.net/file/durolusup.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bed8c6e4b---xekebiporipusibila.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45725437750.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/70788797349.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/501109cf5ea5ce257bd43cd1a86e31ff/sarume.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/84484427799.pdfIn PDF document text
    • http://intertribo.sk/files/22812126763.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/jesasowule.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/9797274280.pdfIn PDF document text
    • https://phr4u.com/files/49613081719.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/13a0bf657ed5be0e65c5f4150c9dce41/zadis.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/legijovijugenisewe.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/mateluvupadovaremalajuke.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/towetizejosabaviwozi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091621564048.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/peritopigevavef.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631134565.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/sojiraz.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/didobonadovemagosixutugu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/47635203659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=call+of+duty+mobile+mod+hackPDF 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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 10848 bytes
SHA-256: 3e386c6ac03fe69fefa8b6a3723328f6b6a288ca2c14032c6de65ba2f226f60a
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 17592 bytes
SHA-256: 9792754e96e8fbf3a57be92a0d823e17ceea92a16092e3ff6a2a9132ca4e784f
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1