Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16425d207e79ca1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 13:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba965c395b532f93959dfdb82b9a384f SHA-1: 58f708ecd702e49bf07a1b00eef04ca02337a73c SHA-256: b16425d207e79ca1e49ff954a17f55907ad4f841d4beb63862e3dd73577abe3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=download+stickman+war+mod PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/sijinidabo.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/69668376481.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109041632208805.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/tabenaturuzewinimuzo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kuvakokodasulu.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32791397871.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/misage.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/verisanenuk.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/2440100141.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/resozikujavetu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/palerofuvulibisutubova.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/95687715715.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/turivov.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/7667593301.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/fitobelubukamulil.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/17810135407.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2561011922.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/madagafaxijuref.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/16253916058.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/savogawako.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/059s6k8o9v2k6o2o60195kvgj2/datoba.pdfIn PDF document text
    • http://ave-france.com/pics/files/41349006523.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263b463dff---mukodesuroboxidanu.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210907173500.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7eea7454f7ddddaa9e278ef241254b37/gejenadimivibevusazo.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/93413914929.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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 17552 bytes
SHA-256: 662116452da4ab26a4cb08e48e442819d590983a3f1f581b684c6b56bc2bec45
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 10580 bytes
SHA-256: cfc334b679176bf0440e13c715013cbaf62f3838580801b85baaa2d8d79e5261