Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f218ad5eb157328…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df87cb60a1a385c26c4c6c1db224bfa4 SHA-1: 7c5de62fbce16c100c0c9e73e589a719ec3fd8d6 SHA-256: 9f218ad5eb157328dad61b7fa3a54d14554067e59e2bfa46bdf311d57538a96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dekogard.net/deko/veri/_files/todejekigorulukasugu.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/hm05gpj75nf66sesir9btn70fu/28519643501.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/67061414812.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760d718eaae---basupizuralasidinazeb.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/96595929853.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/kadexir.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/33190838923.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/supivanetet.pdfIn PDF document text
    • http://kleiberit.ru/files/file/48961500622.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9378rs2p9hqv7u33tdnqoa1sm7/dajigabef.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wesekisofejijemokak.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/639bd5faa03d5c416c85e63b082e0cc9/84814488988.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/11009427943.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5uvui3mel0jvc2fqiqucplu0g3/pajeligegijo.pdfIn PDF document text
    • http://chongros.com/userData/board/file/mapoxo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/afb76a164fbfa1f90f27d94d896f1900/26998811362.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8d64f680---80743815729.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080215dbf6e0---xofuvemuloxoguteta.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161050248580d0---giwizolarazogimoni.pdfIn PDF document text
    • https://losungversorger.com/product/file/50254813658.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8141718b28a8f61cbb246de82588fbf6/biwiv.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/1902703372.pdfIn PDF document text
    • http://flirdining.com/uploads/files/71746221566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=logical+network+topology+pdfPDF 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_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 10876 bytes
SHA-256: ed5a9d0de3193bd446ecb390d1977a2dbdfa822e1f40318f8546ba10150bce78
font_01_sfnt_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 14380 bytes
SHA-256: e0535014aa1ac90ac25fe0d297e4c75979a975351abf357c99a635e3e25e9db8