Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ad1b2003fdecf8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 17:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b96b991540338522b952cc0cadd1599 SHA-1: bf025f37b7bc5080494e60bfd95b285939b4b2fa SHA-256: c9ad1b2003fdecf8988387f3b9e53902125c165be98b242344f168d3a7c02a3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://scea.edu.mn/ckfinder/userfiles/files/geluxud.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a12bec042e---ravile.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/videjajafutiporol.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25d83ca1bf9306dff51681ac29f14821/63522386759.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/bujejewinalonovukasazew.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/43153609038.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zasufan.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kugokekofakerepawabiguga.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/13915296c9fe1b7ad0cc81665119d802/51088346977.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e56e6670b---pezedekotedorodozibovudas.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e631211967f---69931282640.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716b034028b---xarunokezemozexitinen.pdfIn PDF document text
    • http://ibb-online.ru/f/file/8987368834.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/at9jhqvil77e8ijoh0v38mnp9p/54297729540.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/nefevexenizejidorafomibe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/pp4c7vhgt8m4bf8dnhfobtgj5u/2505033810.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e391d6c10---52282150133.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/numebazetaw.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e677961c5ac550d127e9f4506f4e7a7/54871937489.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/16795787445.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/31122972840.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/49199037685.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/43854026231.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/3408770365.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/tegat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=micromill+2000+manualPDF link annotation
    • 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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 10328 bytes
SHA-256: 5e49abb260ac3ee76d2057aeac20ef73465738f055669a1012d1b1aa83e4c1d1
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 17872 bytes
SHA-256: 04234c55a94b8aa744336cf8eeba79e4f5ab2fb0e7771e07196126977d15de25
font_02_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1