Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e48ec64dd4468e…

MALICIOUS

PDF

95.5 KB Created: 2021-07-27 22:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a5e3a174c957c4e9cded8df45f22a73 SHA-1: b1ac1004bd63956db689ad8e03753dbbcf32e1f5 SHA-256: a7e48ec64dd4468e71a51555cbdaf8def44fce3dae6744b587e265258106afeb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using CMS uploads. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krzysztofmalec.pl/gfx/fck/file/tabexiwiwinobifinobelufe.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e8c4cb5ed---54010611502.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091339fbdca1---xiwuneluwul.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a29439979ab---fepasesekevadadanixem.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/60677278734.pdfIn PDF document text
    • http://hydrem.ru/images/file/rodejuwidebupiviwax.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/49092724230.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/87089445651.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/11159709086.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4adbc43b5---wazuwirewoluxiwujakemi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uhj68va7m676sp27b25dpfu140/xatefimezet.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/88876203542.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/083bbcc04db5cbf2619c06de6ea36fb0/70275165036.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/69746126674.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19039b96a---kavofozi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a743f517375---nagexok.pdfIn PDF document text
    • https://goodline.by/userfiles/file/93529487465.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/69285625816.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d5c6fd96---32394036035.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/osjik5dhgdombu9pusrlj9ef3p/pasime.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sovevopilosopaz.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/97051328709.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/84830563879.pdfIn PDF document text
    • http://castel.lu/userfiles/files/28514199152.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73ee997f7---85299010139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=guns+n+glory+mod+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 10844 bytes
SHA-256: 30be1541cd2056dbea14567ee4aa7e640356e657f83824dad3b1e76cee7ddfd1
font_01_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14051 17364 bytes
SHA-256: 99f6baf9b0cc9738e14c6bdee45d4f10d90902d2b40024de41e37a94c64e7d97