Malicious PDF — malware analysis report

Static analysis result for SHA-256 831721b3fe0bdbcd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 20:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4284d745471ea9373edb9d1262afcc7d SHA-1: 0bf9423c9ac9e29f7c3054c19c8561cde29712dc SHA-256: 831721b3fe0bdbcde2d4f085b9b0d62b2b988703941d38168607fe0faad4a831
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the conclusion that this document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://www.sudoku-cool.com/ckfinder/userfiles/files/papodowufen.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/falujewafuju.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/sovevutosenufuvufemizef.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/perexerokozowebupo.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74956940891.pdfIn PDF document text
    • http://chinazzjx.com/d/files/64241983334.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/61612677783.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/lanonozeja.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/23068815614.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/bujikibefeg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b96baf48---78733079946.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/87314433093.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/sowoziwi.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/5232890999.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/woloxetupogiwebonor.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/24095738840.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/26366350066.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/79130389667.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kokazuselomexeg.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f2f54547---sodusuz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142c8fe05c08---bitofekanugija.pdfIn PDF document text
    • http://newshop.jp/archive/file/kewugononenozidaxex.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nogatudokivisipepiwovaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=slingshot+smash+shooting+rangePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83733357697.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 10628 bytes
SHA-256: 78a8cff9682ce86f0706cb60b062043a0857cf161ebb166f2ae23270d9a8fcf2
font_02_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 15596 bytes
SHA-256: a1d031b3ea121252810a7cec4ab2e6c3ee22ab50698d3a5584184d2af50e9c2a

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