Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc13c5caccd8e10…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 11:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8efd25f674c27e96c9c91bdbec085b75 SHA-1: e84ea4b7b4da5ab1dc975123f40b5317f46d1394 SHA-256: 5bc13c5caccd8e10af0a4bff259d49c9a7569b3d71cdd7887a2a53bb6d75bfb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The PDF structure and link farm behavior suggest it's a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cosmic-kino.ru/sadm_files/pirevizun.pdf In PDF document text
    • https://palcev.ru/userfiles/file/24820619190.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/kegozadixokobasinitobe.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/zibofizoferipajazit.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/80600808263.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/puzojapa.pdfIn PDF document text
    • https://irantruck.ir/data/file/wawanajovupetomatoroma.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/42393069461.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jonezeweru.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/nurenusomuwi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161294c4318e27---kesodinilamewof.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/32140257275.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e476d05f---zuzos.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/l6jlr8nv8mrndbnpqibcr5u252/rumomigubozafetosubuxile.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/81d9c802f23badbc297f703da1e7cfdd/52611121602.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/scqmro5ig5vs7n887h35i2606j/48479881859.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078c25c162d1---gagabaminido.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/pinevipegezebul.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/zurumib.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/50040810650.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/xilotagaziw.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/22352524804.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/31239422473.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1744a75ec---bakawabitatagulopowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fisher+vortex+mixer+manualPDF 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_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 18496 bytes
SHA-256: fd1aaf153dae80682bf96628e27d9ffb842d10a6dae0da2d0c11e7cef2239c11
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10616 bytes
SHA-256: e10a1cf3026178d34716d6a0e488c187774f31666bf8e49de6590c375398b007
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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