Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a47ba4ea4836c65…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 02:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec3816d956df696df72baf403a1f8526 SHA-1: 3ff4c07fbf0fb202824929a1d3393dfec444eeae SHA-256: 0a47ba4ea4836c65ff75c6b4e5d85e6831866d69326dae6bb0785cecc4770272
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the heuristic identifying it as a 'SEO_DISPOSABLE_LINK_FARM', strongly suggests the document's purpose is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6f11ac064f618bc64d5894f8594d29b3/6868947007.pdf In PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/65366940966.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964cb96e6a9---juvunulirumuxekeragapaxep.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/lupuzodibola.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wipadevurawigi.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/belomoropixuwojezi.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/52496993295.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/darulijekevasosob.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/34831822651.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c500655d47---vufomomidobibak.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/koreperifexawiruju.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/53456621234.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/62728905892.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/lr17kec7jb37k0gc56psg0mp1i/mozabirowewimufanolusu.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/xeziw.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/49062512909.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/356ppjfvfb9masc35j11ajifg5/gimiwite.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0dcb59c2c69cbee96b6a1ea9868747a7/92862976673.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/gesokidopawuk.pdfIn PDF document text
    • http://firegallery.ru/img/upload/20249426417.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/84fa6cee52c944a875ed7c3cd8da124f/10452345451.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/8234556400.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/7579872825.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/97233758139.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210828_D11F67BF0E93CA87.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ferritin+y%C3%BCksekli%C4%9Fi+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://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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 17804 bytes
SHA-256: 1c9c2c5877c3731fbaaa14748d893b1fd6bfe4aed7bdcd910dc8d66f86adffd0
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10816 bytes
SHA-256: dfad659bf928243bafa053babd1c3acc457228cb4b5f41fe62f08b4e958f0dc9