Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cf82f17164202a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-16 02:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd3551abfa653112de222035f3c8930f SHA-1: 52a3fb1e6044d65d59d377779ba69caa48c736fb SHA-256: 04cf82f17164202a5d685823ac3400a2eb4ac556124f1b19b30767c9407df1ae
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, but the structure and URL targets suggest the document's primary purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda771ea00---nonuzajididikelubaja.pdf In PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/regidakuximenurali.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef9d37046---bodunuvodumalakodojadipon.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a457d14c54be3d89a50c3a59d4bf2f95/94948725139.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/dofutobopixel.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u7ra6o5vjqfg6u28i6url23euf/jofefowerexafibelojoru.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ape35chbvngv05kvaugse5m4ln/22177734469.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/53034260035.pdfIn PDF document text
    • http://boxethai38.comupload/file/68794918189.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d3af8a9f0ad134085698eafd016c59a/48707879953.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ba180fc31d29e86f7b5174bbde7e7107/32431319193.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///60350551058.pdfIn PDF document text
    • https://baptistfriends.org/media/wejofejugarujodakila.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7ff5c55c9569fa50287015dfa15b983d/vidoxugu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/kegutelukugowimas.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc08b87cf4b3677fd13a8a95e9e577e4/58287057033.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a2de02e8d906af2309ef7d897ea4da1a/27142790381.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1aa12238425a655a82504fa7eaa1bed5/kijitonalala.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/majerukoxumud.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/90581385335.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cu268dmg6kmp58bjhh0oa2n9j1/bosaberavi.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/xokejozubebetex.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccdbb3f654---demidaravofoxekof.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8bf1fdc5d409c67a9cb13b3cc99353ef/79683009526.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/43333698368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=courage+song+by+celine+dionPDF 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_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 17068 bytes
SHA-256: d51dc874dc390c6f1133dd5cdb5324ed562b49de4abb606497efc9ca13006720
font_01_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 10832 bytes
SHA-256: b4e035233d459edaf1de3ee65ec5f4af0d2aa2c24c1f938a342cae174b776b51

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