Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48c0dd928d42659…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 236db9c5b43af24ab5fcc010b4fb7aae SHA-1: 6da6059617e93db1b0b8404814d43a1225d520b2 SHA-256: e48c0dd928d42659a231b6bf0c6cd47f0b253b0c56f1bc40b37aa2a2f6d70337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uovj27nsneo0e544jdif2t7am4/7402071162.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b275f5a258---jezajiwulamulore.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/pimelig.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/tinilorudude.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/letaxipexebetozizilugav.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5219ea90eb---91722889701.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/41343404770.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sevasir.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105300503217840.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/du3m6ras23u9k8ofhhqp6854a1/lebomikulomaxijok.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/wevupulim.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/munojusibebax.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072812180673499.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xaxoxapu.pdfIn PDF document text
    • http://twilaw.com/files/files/mapalivoxama.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zolimixurewiragokikomasis.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a274b2ba933---45411655552.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905040537831754.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/zetobuxikoli.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160be3631813a9---9764040352.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/31109075119.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/95959978963.pdfIn PDF document text
    • http://planbmedia.hufiles/fifamewulewo.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wawanasusepadibem.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7196729004---zusoxabena.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609863cb2fad6---81752647999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mbt+orthodontics+book+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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 10604 bytes
SHA-256: 8d36690b397bdb2e598c339f625fc41c6e7f98898fe36ad033cbfaf41e37ea47
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16400 bytes
SHA-256: 992a16a93561e52bdaf20b5e7963a63f300504ea7d17485058638489ccec9de9
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1