Malicious PDF — malware analysis report

Static analysis result for SHA-256 78447133dff736b1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d6add265dcd243a30b7829240b9a83 SHA-1: 06ae0c9de16da406b4a33ad1f759f187b50daff2 SHA-256: 78447133dff736b1a3eaa58d4ad82bb078825a71cba21e2e6a608dc28ca2d558
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://jungleflightchiangmai.jungle-flight.com/Uploads/files/wafodexukebaxori.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/41552733836.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/kekilasorowipo.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/pigunukoxazuwanofofid.pdf
    • https://giriconsultancy.com/content_files/files/zazelokomu.pdf
    • https://belretail.by/ckfinder/userfiles/files/85760782520.pdf
    • https://network-italia.com/file/32574714752.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a30c72bee---zafewoparopu.pdf
    • https://lordoptika.hu/files/files/11245914496.pdf
    • http://yingtailong.com/upload/file/210901123834905258oyx49sfdtkr5.pdf
    • http://www.pattyn360.com/upload/forum/files/wojanadodedexugi.pdf
    • http://rnralpha.cz/res/file/vibedorovexepeserasa.pdf
    • http://svx.su/ffile/file/wexukipanizekudesas.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/podalaw.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee44bb9cec---89799412624.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/49696988413.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/poverosajoderow.pdf
    • http://apvn.info/userfiles/file/sogufivejobikag.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac1882e451---70651473817.pdf
    • http://zuche0551.com/upload/file/nugorunulopobaw.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba9a6c66a3---96902753246.pdf
    • http://ruihuitax.com/files/file/vodaxe.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/20135388190.pdf
    • http://kxzyjy.com/CKEdit/upload/files/39931200369.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/jagolazijenesifekawokata.pdf
    • http://vallovin.it/userfiles/files/ramuna.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+iphone+hotspot+to+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_off0000c615.bin
da941b33ecf7949aeab9df8b22337b7e72e08fab38310ed0973c10a0b6ab8833
pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 16900 bytes
font_01_sfnt_off0000f143.bin
7a9fcf53bb3b57ea59dd9cba597476092c533d998f4016691adf537d8dd8a1ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10644 bytes
font_02_sfnt_off0001099b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16792 bytes