Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82b6139bbbd82d…

MALICIOUS

PDF

82.4 KB Created: 2021-07-17 05:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db470cffd14f2a98206b879d32728fa7 SHA-1: 4f292faddd07e5dcda995e825b0acde7270fd7aa SHA-256: ef82b6139bbbd82dbbb68c1230e6ca71bed1a50e34b8f8fa45711799e87e05ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these 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 http://ca1970.com/clients/10044/File/nasirelamodit.pdf
    • http://syarmarka.ru/userfiles/files/lemojunugelumitid.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05bfbaf45---72897296606.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b979b601f40---rezifewupofexifu.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/31710808543.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c1d68c5bd8e---josim.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce161871037---47810534447.pdf
    • http://acpiindia.com/userfiles/file/48085782592.pdf
    • https://senhewood.com/d/files/rovenitibozapowodunuf.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ilp7te31pm2cud0at5bb87hvfs/furero.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dfk42igpn73lsovpdslq58d6a5/39866078315.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a6u35cf15manber4uva352gff5/46413799184.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc6067afb---rasijatuvivirigixo.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bkpj66c640tpobc4msql01lr33/23774942952.pdf
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/86514535960.pdf
    • http://aliceinformaticasrl.com/user/pages/ruwenurunozetegumulotor.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160841befa3f9f---30499760348.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/nq08p3ri6k43tmh6jehghgd1uf/xurevujuwom.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/77278489545.pdf
    • http://absolutelyneon.com/userfiles/file/17537362848.pdf
    • http://chalappuram.com/userfiles/file/63259495771.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1c1523eb6d4eda945c6813c6a99d11b4/78126110712.pdf
    • http://aihyang.com/userfiles/file/pobuxagetixeda.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/71766514078.pdf
    • https://rubenoferro.com/userfiles/file/18319541344.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/sevisejaxetapemugi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nfl+the+weeknd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
font_01_sfnt_off0000fb08.bin
2448fc6ca7d9fb96acec54608229dd4bc05ec19901bf17adb46d007a959575be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 9964 bytes
font_02_sfnt_off0001110a.bin
837507572ba8a7b9ba060a53985aec36cb4b39cd4b1b958d73bcdc38c76a48cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 16956 bytes