Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74a31e8a16e04f6…

MALICIOUS

PDF

86.7 KB Created: 2021-08-04 17:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b80dad053be338971dc7be73c65fefb1 SHA-1: 3ef0a285cb0f03d35efd00836a6f85a3aba6ddd4 SHA-256: c74a31e8a16e04f61969fd3de7bd0843ba96c1510191be1bcc073b81d36df568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable. The presence of numerous PDF links suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://insureavisitor.com/userfiles/file/polebumiru.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nawatog.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/78267926660.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risedafakeju.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wepipi.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/nufudelerenuragujev.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kkvmm3e3tdev3rrmksi61m3mq1/watujejeginewaxowosikadu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe1110a09---45036953032.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b090616550---47694184499.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e642d7987e7---19644477752.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/sugujeba.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/63365225753.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c171bab4---jakevijagililawodarabi.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/55302267719.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/55813152541.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/bugorujijelux.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xewapafabubijo.pdfIn PDF document text
    • http://funperm.ru/content/file/29388052911.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/takilefajomufupe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2cc6f7e9---garonuvak.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607647b329f9d---jujanoradotexel.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87729975643.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7fe4c0ac---gobotobanozamevin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+measure+grand+piano+lengthPDF 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 17792 bytes
SHA-256: cdbf4c24ca9ac8414fc9e7ec359d2a274b7c03914f6fc471f551ea24d284c5ba
font_02_sfnt_off000133f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F8 11016 bytes
SHA-256: a7ea6d85499d5f8fd24cfa9a49e33af69716f8554500e28eb0d5b11cb00aef1e

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