Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9582d8eab5bf2cf…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 19:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b52cfdfdb7e1e0366ee19ae423a02d5 SHA-1: b6bf670e032cb609dba9646177da666c9ca90287 SHA-256: c9582d8eab5bf2cf1054ed08c8678ab644e0232e4bb727d09360ea2b205039e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://catamma.ru/uplcv?utm_term=crash+bandicoot+pc+download+full+game+free PDF link annotation
    • https://debcopharma.com/userfiles/file/7226240920.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/52441260229.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/69841638999.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/24446547875.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d6816c5d---xosedamotivijizuge.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jezewudureriduset.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210914122608442697y3s5us.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144641b2be63---24414424481.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/76322489480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77e2e72b3---pogimeboja.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/68990275989.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/93573647309.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/83409606094.pdfIn PDF document text
    • http://topstec.com/d/files/penigede.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/9929543674.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/16548871301.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/dovijozemaxivekinaba.pdfIn PDF document text
    • https://razredna-nastava.net/files/97533077048.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tagebaso.pdfIn PDF document text
    • http://congtyvima.com/images/Download/74708500072.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140887d69bb9---kisiti.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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 17152 bytes
SHA-256: 618765858d568e8e53e4b9fb27c358ee6e0a92cb56dcc5faa8c38469791ddbf4
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 11424 bytes
SHA-256: 5b3383b3f9ecc48fc4143875d050a722f65ebf87b1ea7a125b5c49cd2fd7ebf6

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