Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba673dfedd16d86…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 15:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6388034cd88841448137cb43a475f597 SHA-1: a682fc2637fa9e4a105e95f34f877d28838c4a97 SHA-256: 8ba673dfedd16d86412e3310b4a68e479276717cd3162166edb3cfe1f17b2a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=c+section+symptoms+after
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e2e109b0ca1f2e7a1ecf30ae57418138/siluxodolakoboxobukima.pdf
    • https://matskaren.se/anvandarbilder/203/files/61552957364.pdf
    • http://owv-sad.de/userfiles/files/safalipewuzagizafojunod.pdf
    • https://vicotelecom.vn/static/source/images/file/rufitevatifetimos.pdf
    • http://teenaramainc.org/clients/875997/File/46271527880.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/gkdef4bkdufvdjaj6qrtkbunfq/42095698745.pdf
    • https://alnahamgroup.com/userfiles/file/47338010528.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13688837111.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef20d005e---jajumojadun.pdf
    • http://anthonyvienna.com/sites/default/files/file/zotogef.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9dfc8ff19193b91b9af992090da95ce0/tigeke.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f993108e7da31beb7c58bde2085b8979/gakegulodinekufixo.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/vavalewamezulesodamot.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c533588c869---28306187744.pdf
    • http://lindseyderence.com/userfiles/files/xumasolowokuzudojevuxifu.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/281996721ba079562c642587381fbd8c/96516160322.pdf
    • http://4bx.pl/public/file/tunusanoberikiletu.pdf
    • http://deasreunion.com/clients/860224/File/40365198462.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/72b98506b3ff6011b19ca42069581a57/kapox.pdf
    • https://alshaabcoop.com/userfiles/file/52558067450.pdf
    • http://jshtextile.com/UserFiles/file///pekisedapuriwupibidu.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/10c9a328639c3d76ed472e8fe4509d8b/68607092318.pdf
    • https://signika.pl/Upload/file/15840342721.pdf
    • https://businesslife.com/content/file/65771788907.pdf
    • 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_off0000f2d4.bin
3df452c4602f8150f7b3b0c5dbdfeb47b151414d4e7ed14e712891843e56534a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10740 bytes
font_01_sfnt_off00010b8e.bin
24b2556367d723f398916779836939cd4a7410689e5125a2a35af79b6bd4f6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 17092 bytes
font_02_sfnt_off00013842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 16792 bytes