Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d6a6fdfd7520aa…

MALICIOUS

PDF

91.2 KB Created: 2021-07-04 09:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a31f09a7e1f5194fb0d3b4690544c43 SHA-1: 307c10946380419542ac92680f92fa541a87b4bc SHA-256: c0d6a6fdfd7520aa82621b65bd561b38c3347c768ede4fda02fb959a4793654a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate an attempt to lead the user away from the document, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=example+of+methodology+in+quantitative+research PDF link annotation
    • https://tidurmalam.com/contents//files/52555810464.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/tikorex.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/81dc462d41e1545c092c9a8ed0c31038/2042880746.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/kivok.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/38880135384.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nnk032h62c97rf2jiju2p8v3d6/36474666030.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/84660497152.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d2c3c09a5e4131d2c74d3116dc5394ce/jonapebuxoguzarapepap.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/98dd796a0ac6d4eae375dcb14b9a1813/guvubanutujona.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/62813393990.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/dawusa.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5e91b348b6f8f6eef8a71ab965f293ec/23943206961.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d5e760dcdc8eb7d9178c1d8421c1e6d/ferida.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/biwibalabobefafewuliguto.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fbd965d1---3719281010.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93acc1519---63549960573.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jugobozarupujuzemutuse.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29615061981.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8ba92908---segizugusadizigamim.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8efe9948---54536518589.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae646d59bf---95711273862.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/252244588248.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/1dl6lmgeatk0bni7b9q4nmg9ql/46810267518.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_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 11580 bytes
SHA-256: 66835e064d938499797ed3900fc564a9c030e82e33d5460a2b66d01b486619b9
font_01_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 17084 bytes
SHA-256: 2f5339681c1fe819ea2fe8cf759547b4ebce3c22a94ae8c1fcb774da15577106
font_02_sfnt_off00014764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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