Malicious PDF — malware analysis report

Static analysis result for SHA-256 954f0c5148471bb2…

MALICIOUS

PDF

58.2 KB Created: 2021-09-25 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2a7707bd4eb89624a40e77e504e8e1b7 SHA-1: eaf59d0879b5f2c7b7aa9971863dfba22ee67891 SHA-256: 954f0c5148471bb285e2a282ac058928887ae2ff94b084813a67ec307c850eb0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7865

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=pokemon+y+rom PDF link annotation
    • http://statsale.com/data/upload/ck/files/kupaset.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/21360583850.pdfIn PDF document text
    • https://pr-dienst.ch/file/lululujo.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/98784862012.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/93114571813.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/t1o3isj3vd9an9obdk078fikdh/toxodaliburutujoserileki.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/pozezepuzididokubar.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/29923388625.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/jigixolidid.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/94505572989.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/xadunenedakes.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/ed78253596d94bb1e4636fd0526725cc.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210923002649.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54ee05f40---50989247114.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b67nt8hi23gns4f88nheij57d4/wivupegutinamegabuwavit.pdfIn PDF document text
    • http://cycling-software.com/files/file/sufesolitamizorokawotofa.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/fuxabuvusovim.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/tofibinikurupasajonum.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zajidagovinerilisi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210925165621.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB89 9912 bytes
SHA-256: 533e1b45cc9ec4c6e2447244d0bb185474ed74e9556893dbe9b2977726621f14
font_01_sfnt_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 14324 bytes
SHA-256: eeed57151826f6d6aea6d85f6743e9edf64a9ae8c23d052b01c07a51f649b9cb

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