Malicious PDF — malware analysis report

Static analysis result for SHA-256 6276530de7c83236…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 01:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0db716070624898bd21e4a2d26a877a5 SHA-1: 51b61abb77690bad708ad14a9fd8e891d025f431 SHA-256: 6276530de7c83236f40baeb42ce94f0048d6cd1688e20fa8b04e9473b0aca761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest the PDF is designed to lure users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://healthlantern.com/ckeditor/ckfinder/userfiles/files/papumetudenofabajixuxur.pdf
    • http://harissarantis.com/userfiles/files/51955673151.pdf
    • http://forma8.kz/ckfinder/userfiles/files/1576434993.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/66367577348.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donezoguraro.pdf
    • http://iweldbot.com/ckfinder/pho/files/83368008880.pdf
    • https://kaptenhoki.net/contents/files/dopedoguromanovowaw.pdf
    • http://coinproject.com/userfiles/image/file/pejuziwexobasobasulegeki.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/guwaxodenijelenug.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/sovozapirakakinakage.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/34906136071.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/549e4710d98437fd56f727b4af2c7ca3/xisafa.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/kanavezomidetabedaka.pdf
    • http://stavclearing.ru/upload/files/17637286293.pdf
    • http://ficfart.org/userfiles/file/62921414648.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614c5acc6f662---68016222504.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/27957669003.pdf
    • https://ncvpte.in/userfiles/file/xirutipodikojuwax.pdf
    • http://francescofesta.it/userfiles/files/12524705356.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614cabd382a8b---vumipafekovofe.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xugegopedemagapuruzilewab.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40401658914.pdf
    • http://logtech.cz/foto/Image/file/54200650423.pdf
    • https://betsin.org/userfiles/files/92496420576.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=launcher+10+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b172.bin
4137d56398e547c0710835904008cd3fcb7b48fcc620009b5fb1dbdcd8197f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 14556 bytes
font_01_sfnt_off0000d61c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 16792 bytes
font_02_sfnt_off0000ee33.bin
b2bff366b6d3f9e0e082b0e510e998111c05c22f98aadb655c1be4c46437ec9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10384 bytes