Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3bcafc2a91a50a…

MALICIOUS

PDF

125.8 KB Created: 2021-06-27 01:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22ee55d62134b1d0858d3e30792eda20 SHA-1: eaa9fabc0fa461dea457b2b97025dfa801ebab0c SHA-256: eb3bcafc2a91a50a43b1ff0e8059f6239663a7b273339ae0873536daf57e304d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous links pointing to compromised websites, many of which are hosted on WordPress installations using vulnerable plugins like 'formcraft' and 'super-forms'. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/802eb7b3bb8757ffe716107da220263c/bifelu.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/80902186072.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf47ac7c334---99130520480.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075941f52795---42525870666.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b348caa34a4---liwirokogiwodexegivel.pdf
    • http://ongnuocdenhat.com/upload/files/49416763074.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ec1f03d2735879bc247e0cb52bd9050b/43276062001.pdf
    • http://fautographie.org/images/userfiles/files/xigekiporawitupa.pdf
    • https://clifestyle.net/uploades/userfiles/file/79771113683.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5991ef857---bumevezezipabuk.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ef0f9871c---76608941977.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p20hus2g9gensr9ge986rt7dl8/51772608522.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0j361gsencsqsnihad8refqhce/38354136303.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e46800b3---22874663989.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb9beade2---monenunulozin.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098722d77d04---67872314653.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/boropiraropalaselovofa.pdf
    • https://loctra.net/userfiles/file/74037409557.pdf
    • http://candybeauty.vn/upload/files/41330512381.pdf
    • http://cuuhoatudong.com/upload/files/nerazudeginozutusipaf.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fa10b1e269a8fc52863f17368302d6c5/tadixulejoxupulujefax.pdf
    • http://okzawidow.pl/img/upload/files/51331329964.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208589059536.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498d1410fb---wegasilaxejajugagajo.pdf
    • https://emauto.lv/index/images/up/file/zotomatimip.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e19502c45---xusiguworemo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=periventricular+small+vessel+ischemic+disease
    • 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_off0001888b.bin
d74f22d3a4d2884a4984fab04a923e517b7387cd1bfa67b3cb6dafc2d1457c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x1888B 18332 bytes
font_01_sfnt_off0001b8be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8BE 16792 bytes
font_02_sfnt_off0001d0d5.bin
4c97e476f6832239ab88ce4495411015f12222dc03a1bd8f981a3206127697eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0D5 10680 bytes