Malicious PDF — malware analysis report

Static analysis result for SHA-256 81176f8f35b1abe4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 09:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92d5773071aa35d8026f8aab05cc4168 SHA-1: c74059156dac0bdc6ab946097d140ca45bc9cd23 SHA-256: 81176f8f35b1abe43b8da1f7340190027eeb1096f517184ede3fa391a2f4bc95
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of multiple PDF links on disposable hosting further supports a malicious distribution pattern, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cosmikkino.ru/sadm_files/98802006695.pdf In PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/6248518652.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/85664152597.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xewugijitefuranobanakufiw.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dad38135ddc8b98b86c86d7a191eacdc/66868318306.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53487004330.pdfIn PDF document text
    • http://prompol.com/media/file/4707167579.pdfIn PDF document text
    • http://www.bash.cl/media/file/kakasulinilikidimuwes.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xibogexogo.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109010701049959.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/25967809695.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fomutewobuzus.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/99499969097.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/21503594036.pdfIn PDF document text
    • https://dacola.com/upload/files/25510577730.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/pibewodem.pdfIn PDF document text
    • http://mobil-tech.com/files/12069688504.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/zatisigetodalug.pdfIn PDF document text
    • https://kristinanamaste.eu/files/juxururabipujituvu.pdfIn PDF document text
    • http://tcihk.com/userfiles/76618907327.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/52418602175.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/58717973743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e365b96e---bawapatotu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614372d870870---60841873062.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/16865093031.pdfIn PDF document text
    • https://2acontractor.it/images/file/sewunutoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=west+game+mod+apk+unlimited+moneyPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 10936 bytes
SHA-256: aaef19adfe1f9731f92cc386173a0fc1ec79afbf190cf5eee50799d66287c8d9
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 17256 bytes
SHA-256: 448319ed31cc986a54975704e8d2e6a4b66892b7817c8d583354120543fdde59
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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