Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b70b848a167fcb6…

MALICIOUS

PDF

92.8 KB Created: 2021-07-04 06:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 140b4baffb855bae7cfef3a5c5941640 SHA-1: d764f58b438ebf11907533e03d04ca7acb810160 SHA-256: 6b70b848a167fcb6c3942370c920e8563aa79731927dd2d9ff4eb75b243a4ca9
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery information, such as private keys or backup codes. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attack designed to steal user credentials or recovery secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://catamma.ru/uplcv?utm_term=how+many+months+does+it+take+to+get+a+bachelor%27s+degree PDF link annotation
    • http://group-anons.ru/userfiles/files/nulapudiwetedenuvul.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/degikikujuladovivirogad.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a386f280e8a---37814331002.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/rujikamonuzukag.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607712b74adb1---wumusidapirifojofesazix.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7791269016c2cab2c068d5bad0c3b075/64148830142.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa44f675204---48866520319.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/xovul.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823d025304b---20550329883.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/437e4d7b4b2093452fc180774f9f0e7b/43779580074.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ivno700l2bf0m7vorjff8g8tb7/wezuzijexeko.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fhed9vb40jc5vpu9r8ggteeh4j/34446468830.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cdab5a92a74c915c118b414da7f75149/jijadiwikisudo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/medazuwo.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/55181032139.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6429c938---pozewuwimedax.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/falidirelujegifowevinoz.pdfIn PDF document text
    • http://come2menorca.com/images/file/nagimepak.pdfIn PDF document text
    • http://klefmarken.se/upload/file/sekagosivixavixujegitixob.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c30e8a57---tiloxakuvukonomilinuk.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375915632---jivan.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/849e5d547ffa4a3b089e02bb1ace9078/pimezalonarelavajawezup.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d99781651167e14fee98fdda258642d8/wugeberomalozevepug.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/bagisega.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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 17028 bytes
SHA-256: 7244cd777658b18b544dd3b8ddc1421e4f3d897378e4b8a6b0b4e89a499dee63
font_01_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 11276 bytes
SHA-256: 8865816606677024b35de70b72ded5e4acccfeab0c602e5aab5c1f9d5901a0c2
font_02_sfnt_off00014b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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