Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a37a23ed8a5cb8…

MALICIOUS

PDF

83.3 KB Created: 2021-07-04 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e134e73c541839e57d36c98565836da7 SHA-1: dc12ba176d9ab22c44f855341da29baf18c30944 SHA-256: a1a37a23ed8a5cb8f2f8001552e8e5fda18b296d8554c3ad750bf05407360bc9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents as bait to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=cite+sources+chicago+style PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/bogewajamisadoja.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/82209430167.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3526bc50---86562126023.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df99086ae---jevibuwilupabugid.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098495676d27---63904442259.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/24359174232.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xuteme.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/96636224725.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/jiverifan.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087702322b38---kudinigejevanulivogusoku.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083296aea647---golixawud.pdfIn PDF document text
    • http://yilip.net/userData/board/file/80769896179.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a51dce936---rezatin.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/73f09a18bf15f5ebe9956348173d3fe6/pivomefonazivuzew.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782c26429cc---teritujedonef.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806cb90dd3f---xifiwarupok.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/wovajataboxogudivatoro.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/tubuwokufowibagaru.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/25656482749.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ni4eprv1jn8kbpok2irqg4e9r5/goxiguxagojokanen.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/33164651202.pdfIn PDF document text
    • http://camwater.org/media/files/dafirum.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c162d619---2838032699.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_off0000e4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16412 bytes
SHA-256: 29523348127688494a56aeedb8e7dc9b76c56880c264702d59f6e618ecd0a49c
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 10652 bytes
SHA-256: 2500d6d967e02794b9c1c4ba99c271d52ec7bef5b9c5af83bbe9da0bb9ff1902

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