Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af0b70d34edf5b0…

MALICIOUS

PDF

103.9 KB Created: 2021-09-04 09:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: caae34717a62bc4046a9d5a957add01c SHA-1: 94641ff576eff070dd3872f853dce82188e73440 SHA-256: 0af0b70d34edf5b00531a02b6403f166c5f3eebbc8d8a3ae73cfe8a6c3510897
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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.
  • 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://cructi.ru/uplcv?utm_term=english+grammar+worksheet+for+class+7th PDF link annotation
    • http://retco.ge/ckfinder/userfiles/files/wafobugevugesav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609638d89d5d5---vitozigajofazuzi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2tc2o00oujle23dfah6vf5rdh5/2156263319.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/57490ec18e1b71eb6d5e69a6a1a3fd5e/65524219348.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fdbb5f77---55544928112.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/kademezibefinatewizozoxux.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zinidofir.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/danererezejemiwuk.pdfIn PDF document text
    • https://terracell.info/images/file/bodaxadimumiwexisifo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070732adb53d---xeberinoposajafim.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/latulojotesolaj.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/kuremevonov.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/4788099673.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zutovugusitovituvewadaxo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hoa67ikepq4512uo79qpiklom2/46781943640.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92aec0bcf53a0bdc114634157e8cda82/43684952698.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160753fb3be901---limowogani.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/80401229559.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/tilipamulovavovag.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/litamad.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210609_BCF091418F73D1D9.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04854f645---84078470371.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c1afd0c4487dcfb48ea0a89f4b9e553c/25418580515.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/1799829378.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bccb10d82---davogiton.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f813b11ad46663e89507d3967be1e8f6/fepob.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/65784264073.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_off000130a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 18268 bytes
SHA-256: 19107f5004b9dd7c5a044b7a2f5f091f27e259a3df074c38c96f447efeaff74f
font_01_sfnt_off00015ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFA 10996 bytes
SHA-256: f43759c21bdc2f83da1cd4ea24d0412f228ec1c54a0be400e550e5f595476faa
font_02_sfnt_off00017971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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