Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf966f296c5745a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 02:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28981b596eece5085993390eaad4e36d SHA-1: f5beeb47249dc4f76dbaa16f663ae8ec8b3d290d SHA-256: 1cf966f296c5745ac832544284e0a5a8058b70f2b00910fa7cfab8baa537d4f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://evrokomplekt.ru/userfiles/file/xezetofuxepojajizuk.pdf
    • https://dianthusindustrial.com/resimler/files/8084108009.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/29648261716.pdf
    • https://piauiaqui.com/ckfinder/files/97474452430.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/wunakuvariketezuz.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9792038869.pdf
    • https://acrgruppe.de/userfiles/file/94355553973.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/63659354797.pdf
    • http://auburn-companies.com/userfiles/files/jepirewizi.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399401dcbc9---ditimezefozasiseripu.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/24690201308.pdf
    • https://bodegoncriollo.com/userfiles/file/47184938525.pdf
    • https://ijfbacknumber.com/editor_up/denolenud.pdf
    • https://onlinendttraining.net/files/lifekuri.pdf
    • http://geyikkimya.com/userfiles/upload/file/riluleripotawejesanul.pdf
    • http://csc025.com/userfiles/file/20210909114921_lcztoa.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/deman.pdf
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/37865221704.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161388677addf0---munalupejiludovo.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0038efa0---wezutolele.pdf
    • http://illinoislivestock.org/userfiles/file/12245907679.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985005f6b6---11671236556.pdf
    • http://ayhancevik.com/images_upload/files/18610657420.pdf
    • http://yh-nutri.com/filespath/files/20210908151324.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+live+weather+wallpaper+for+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_off0000df4e.bin
dde5307c15d161b30275829b69a1d3772e380ebebe2704bf4ee3f81950e455a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 18064 bytes
font_01_sfnt_off00010db8.bin
63d4dec16f4f5e4011d6a607609f3b3fec808448e12c25532eff02796831fee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10800 bytes
font_02_sfnt_off0001269e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 16792 bytes