Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97a99780ac9cae…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ccfc9d6acd01515ac9aba6c09c32692 SHA-1: a21b88467648692797e88056506a10a3557c041a SHA-256: da97a99780ac9cae257b81ba91dc9abdd4e831a11647819e0feeb8811bd4804a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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 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://wastran.ru/uplcv?utm_term=apps+like+gameguardian PDF link annotation
    • http://15441707.com/data/board/file/20210910052048.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/71560130976.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/nokakeneposabas.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/9148684798.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/860b0e17d3b953bee0f4a16151fd1fc0/vegetegagifemizelekagewal.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/vimubupovogamibet.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/44229328695.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a66a07bde---foguxokosopugirozusesur.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140394c996b3---39556595058.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/dafuwapimisiworejifesejat.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/82715065899.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/vaguk.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/voxesowosoxexajapajakex.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/70997851523.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/44ebd8526696c58136923d81f7618c7d/88225504213.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/dinizir.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/88377921365.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nimobakuvasenemufoxumimo.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/dabanaloxuzobatideje.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906000316506.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/bosokat.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/21351075528.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/vovurutodipokusizidumemu.pdfIn PDF document text
    • http://knipia.com/userfiles/file/vodaguzajegov.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_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 16468 bytes
SHA-256: 9214255255f71942a73d44126f006a5b1ea700024031ea0b2f3730aea4825db9
font_01_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10692 bytes
SHA-256: 34df148486952ab9ebec1c0cb325db5763d6dbe5f9e3c88be645a8b8b795d2e8

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