Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada54f78867a4e69…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 23:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2479e65c047b0693f5aa801c172eff8 SHA-1: 51996accdd6326042f46259f58956007d40282b2 SHA-256: ada54f78867a4e690ba8a8e44e04564a2de0315aff1dd3805ee32e35c5d739db
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs strongly suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=jurnal+tentang+flavonoid+pdf PDF link annotation
    • https://cortemadera.com/wysiwygfiles/file/wibimig.pdfIn PDF document text
    • http://xsteelstock.com/d/files/davivemasaxusodozuzamewa.pdfIn PDF document text
    • https://digireg.si/upload/vawotisojirakizudunowop.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/8900784911.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/mawuvenupajakepimire.pdfIn PDF document text
    • http://cy2hand.com/userfiles/biliwiriwodorase.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f919aa470cb---towapodezapoluv.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610968400329b---dozud.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fbd260f277dcab54432aee972376cc83/delafexakitosozevaxuxekup.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/geguzovot.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab9b71cc---gekefajatevutomojarizedo.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210901_67DFB9AAA6FCA453.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076db9592bf3---86491052210.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/58009387941.pdfIn PDF document text
    • https://naoshima-habitant.com/feduk.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/wutiwulukumugik.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/77769660870.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/razikanofaguzenifawamuru.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/50353299632.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/48758393805.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/puzuwupome.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/sijepikulozinudonubalut.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/87050315114.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/kf82lku9c1k90aqalnr8e95qlkpkbp1b/zebajula.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/50960868580.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9f8a9b1c8b50fb1fca6caf4f5a34a749/zikoxomivosupetep.pdfIn PDF document text
    • 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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16672 bytes
SHA-256: 4e0eb6169afd1c42bb3ab5e9b79a534c565033c488fac553037a2916300f320f
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 10660 bytes
SHA-256: fb929145d6ae76447f02407d1aea7cba400ba5a3282c5c433c535c197cf50c0a

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