Malicious PDF — malware analysis report

Static analysis result for SHA-256 d843eb06b3cbce39…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e296931d8d6b9ca94772e95af5042a7 SHA-1: dcea796c792dc16971fc0abf8eba14a173be20c5 SHA-256: d843eb06b3cbce3953b4df248055504ec38ab297748bc97e2cae0b680f25fb74
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://6nergy.fr/6nergy/sites/default/user/file/jodukojepir.pdf In PDF document text
    • http://goldstecq.com/userfiles/file/dakapefedizogipoletexe.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18276428682.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/molukotisegeboxiwejub.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/xurefotikuxiwojajetubaruw.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/47627915612.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/xutigesefefolixarogu.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lujifemomarekodenovutow.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/98f28597616fdb1729c6df6a52dad4d9/90446873630.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b5egsk8b8mgulml4tvgp0gq07v/mejisisagelizuxuk.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7ca6d219---98986673074.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77092738308.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/jesupativunedebewa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ufull8gtit7e74ge2hn3dniroj/valafuzulisivese.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/fofogorizinuweredotid.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40337371931.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3472c19---91879571886.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/768950953.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/94994405052.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/29534779458.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/xevupomifupodor.pdfIn PDF document text
    • http://proart.by/media/file/labuponituk.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/muruleninetorelabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dragon+ball+z+shin+budokai+zenkai+ppsspp+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 15828 bytes
SHA-256: e2e5136b80135db0067459ae1673f6cb7a82fa8afdd3c53215ce4222cc2f07ee
font_02_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 11052 bytes
SHA-256: 40043a38544835b16fc78f055a2aa722f8e85f926f278756549c31d4723674d3

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