Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98a9d3325605cf1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 00:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8bb4bcd7f03bebfcc4f0331d09a3c2e SHA-1: e9bf3edf564640f608c3be4995d28297415466bd SHA-256: e98a9d3325605cf19c587a51477c5cca7dde2383fdf6fb976fe611c6122b2482
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm and heuristic firings suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://turdv.ru/SITE/files/editor/file/73286688963.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d619805254b1ba8372d4b460eca24a23/kubosiv.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah76uad9nfeoolvdsjn65b9os6/pefubemonumowulumedaf.pdf
    • http://kingsap.com/file_media/file_image/file/tezakunaman.pdf
    • http://jmk.kr/ckfinder/userfiles/files/ponevi.pdf
    • http://babyshelter.net/assets/upload/files/39159923817.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f908c1b5---34376872373.pdf
    • https://internationallanguagenavigators.com/media/tawofixokokivivugej.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/92303471206.pdf
    • http://rm-centr.ru/uploads/file/50251409601.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/komigamu.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/25447701822.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a3de2755---busovajijitoj.pdf
    • http://321eastern-thailand.com/userfiles/files/77549038000.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/jivanopuwoluriwute.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/sikekumodu.pdf
    • http://saigonford3s.com/uploads/2021-09-05/images/files/83818388558.pdf
    • http://gibisch.biz/files/files/gatifo.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d38024e59---puwedikosifametekirij.pdf
    • http://e68momo.com/shopadmin/upload/files/zuxefedomitizupewajazaras.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/11098070176.pdf
    • https://birutelorasin.com/contents/files/17530198273.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=remover+conta+google+do+android
    • 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_off0000d4f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 16792 bytes
font_01_sfnt_off0000ed09.bin
dc5d5d9ef890fc05a8d08b4957ccf1b7aa7e6cb545a4726ce5a753fa437d0444
pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 18800 bytes
font_02_sfnt_off00011ce3.bin
da0357106fd056fd81c0463635732fd8c56e07d5049f3109702ff5a238d2e0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 10656 bytes