Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29627291f3bc4d9…

MALICIOUS

PDF

82.8 KB Created: 2021-07-25 16:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25eb034b26ad1c1f64f67cb096c4c61b SHA-1: 94878b5ef70cb2de4516af15a7e0910d3a24cca5 SHA-256: a29627291f3bc4d97ff2858a8348ca007b748ab2d169e6df2fec03f6f1569bba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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 https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1rikara5bfcc8n17p95te4e6gn/79142710169.pdf In PDF document text
    • https://bahispesinde.com/gnc/veri/_files/8524637669.pdfIn PDF document text
    • https://daismene.it/file/77837588764.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jexiguvixozugul.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wejun.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/rfj338lgbd9e22blufrve2huls/gudifenudut.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/vixesuraw.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/22761797433.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c185ad12b65---85622719951.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9852ea5c---15404141843.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/6937217429.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/susigilefokepilevisozar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a511ecc8a8---94351187074.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/48414178963.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/jurobosuvam.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/35353923359.pdfIn PDF document text
    • http://aquatherm-graz.at/files/buvoku.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/90239473686.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/32613368214.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/seganol.pdfIn PDF document text
    • http://allasclub.com/campannas/file/faropinozonezinuw.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/dizebimubiradowurised.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/84950991033.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5513ab079d84a9d92682ba137382561b/gedarumunojanudagafegeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=essential+university+physics+volume+2+4th+edition+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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 11344 bytes
SHA-256: 30e29874b7c8ea9c4989c21f7e2f90fc0b1d34458cd76a22cc967960728bd43f
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 17276 bytes
SHA-256: 0c99c68ba17a7b2666add742e903efd854a52a0300d4088f848db8b0b0de7a97
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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