Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e6ae0f494b867…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 20:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b978f24a4882ac4a15f18465f5741fdc SHA-1: b4e0d1f024a699d53cc3051a9b0118f6d1cb68a0 SHA-256: 771e6ae0f494b8679907352a8854c93f68745362bc96823a1273e8ca20eaff7e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or distribute further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code or facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newabel.com/ckfinder/userfiles/files/muzuboputedereritubebe.pdf In PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/wobekujebu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/sisupezipusanidafoxi.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/37151238504.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0d18ed2a---jirapoxewogoja.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/pirepefasedo.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/58384863650.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/99346085260.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613703005fa54---21507513574.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/24797191559.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/57990240131.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/14481677635.pdfPDF link annotation
    • https://bulendengin.com/upload/ckfinder/files/napefizadezepoxaxubomuwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/29586354787.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/44196951366.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/gafip.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161385051aa84d---sejipolok.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/74564452414.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fizobu.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/gejijufoduverevuk.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/gidijuzeruvunemorivaw.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bijotuvelikifubiripixefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=super+mario+apk+filePDF 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 10416 bytes
SHA-256: c167c3289b1c487434e565461a19cb7b815b25cc3d4b700bd6ad7c7c08cd3c58
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17992 bytes
SHA-256: eaff63e53ad1a9a0fbaccb0e3eeba09ab71c8ec5ed88f99d9acee7b31517d84b
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1