Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5f53cce7a051cf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 19:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 036727d97f77990cbee6c02c02fc3f33 SHA-1: 39db5ac0afa0abfd2ce5deba96c1e6ba2c5bcb5b SHA-256: 1b5f53cce7a051cf1831d1dbe417fe4b0fe0fdee74c60b89a58652436aeff0f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, such as http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fveobgcuv4osa7t6kpr89fclgq/dirigedizipofaruxabapev.pdf, likely serve as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/94551419337.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eh20frnuodrpqb14bfvk1snbc0/jisafif.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd4de73a9---suwiwawexo.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/lonidepefe.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/7684251098.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/wibafizufogakab.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/lekopimopibezudinitak.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rovokizivokinilek.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064b73169b---gizab.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/momaponid.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/xidaxopamisuwos.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/97839431312.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77509177749.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fveobgcuv4osa7t6kpr89fclgq/dirigedizipofaruxabapev.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/75762788736.pdfIn PDF document text
    • https://hoongnau.com/upload/files/99976850738.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/59528526716.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/rosoribovopaxidomeveve.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobanonusitex.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/fatat.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/91297982558.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c8ece80ad1ec63ae69624b30da2a9809/15551778413.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/46583131237.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/folokulusuxasedosokoz.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/pebomuzatosezimede.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/muwofuvuvinago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dynamons+world+mod+apk+all+dynamons+unlockedPDF 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_off0000bd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10880 bytes
SHA-256: 8d7237f3a8d312ebf3a419c08b5072a14af99b11524f63e2bd9a8c21ec08b86d
font_02_sfnt_off0000ee5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 17068 bytes
SHA-256: 760c2764e571bba62c8fec1d9407a65010fd372e63aedaa2dddf07b729890782

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