Malicious PDF — malware analysis report

Static analysis result for SHA-256 91eab1b9c3903e53…

MALICIOUS

PDF

103.4 KB Created: 2021-10-10 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf940d56d26436d89dc2ead0f08f14e7 SHA-1: c35c3003e54b7fb756390708f82d49c661a5c5fa SHA-256: 91eab1b9c3903e5309350c5444333c18cf4d3a307bec739a5347b867265eb3cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=congressional+apportionment+definition PDF link annotation
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wulopozulududisiwozixez.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/40862318624.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/23508216481.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/sojugedef.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/gulivigepifavi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/99579960084.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/12035546190.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/96553209885.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16150b542e0374---56495348014.pdfIn PDF document text
    • https://gcs.kz/data/content/file/ledudaz.pdfIn PDF document text
    • http://brenderup.ro/mm/file/moviropoluvolilakuv.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/jekufujanutunak.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/55d04e9dd8ae6774a5710df6e025f3f0/20901190320.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210921231957909.pdfIn PDF document text
    • http://smirna.pl/files/file/49611738041.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/doxiko.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/53602394656.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/52896460672.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vufakusoburel.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17052671089.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161af04ce3c7---burif.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/75bf7a540bc671af5422d505867dada0/88636100351.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615ecf5eb5941---63605610540.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_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001422a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422A 10872 bytes
SHA-256: 041446cfc16099d339770b4b4a36e411cb673b9a4bcc8ff308e2db3877633c3a
font_02_sfnt_off00015b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B16 20104 bytes
SHA-256: f24ddb511b9c422ad13e2a0fe99b4bbb20ab71b5eda8f5d1be744fad1701c160

Open this report in the interactive analyzer, or submit your own file for analysis.