Malicious PDF — malware analysis report

Static analysis result for SHA-256 627e231342b16933…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e6ee53401a06987c9fefdd7ac050f3c SHA-1: f9e1da16b544a2a18622cdfe0cc8be62dbf18ddd SHA-256: 627e231342b169337ea4e0fe18489a9dacc5b50e76636bab3848dc897bb4e53a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=schafe+k%C3%B6nnen+sicher+weiden+piano+pdf PDF link annotation
    • https://thucphamtruongxanh.com/Upload/files/64450470865.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/7406355974.pdfIn PDF document text
    • http://cobmedia.hu/include/fozenuviwegupinebalok.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210907142126.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/41162653022.pdfIn PDF document text
    • http://i-physiology.ru/upload/debusidifesawedifol.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/gupivememibuxupofabigisab.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a59ef66457---98981015930.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/tadevowisisogejukeg.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409723ca34c---vizikijakolezufafuvopok.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/56911137021.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tepiti.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tekem.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lowuposo.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/88916196146.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cc8vmcu0k8mqgdqmiiomi3cij5/pikasagixoj.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6b46ce3000fa603d80ff111742032264/daxagodibobemomipewuzo.pdfIn PDF document text
    • http://spbi.cz/res/file/86979969371.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/49519754400.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/zopasepigiwubedugoladese.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/jaranivav.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/85474466129.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/13721096929.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/tedalakoxarekupiwin.pdfIn PDF document text
    • 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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 21408 bytes
SHA-256: 254bc9ec439c645d3824ab8d90f1eb472ba13b5edd4c432d5603dbefac0914a1
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 11040 bytes
SHA-256: 5293438ab56264d74632ee4d0526aba9bd79fa08fb815d1fa379a65bb6b53f6d