Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23507b598a69cbe…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 17:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c40485a762c147ff828baedc580adff1 SHA-1: 9de3b300ab95761cfadcbb4894d2941d365665c3 SHA-256: b23507b598a69cbe1ce1c5dabddf609ac67648d2c18c954bfab609dc6029b8af
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged the PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious sites supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kleinschadenexpert.com/userfiles/file/97756496569.pdf In PDF document text
    • http://kartelabasligi.com/images_upload/files/femeguzipidudadi.pdfIn PDF document text
    • http://www.centralperdana.com/file/buxure.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/84743105804.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/lejujifodetadepuweko.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609671b747fbf---67667807358.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ec3dfd182b914d512cf694c2befc5ad/suxuradojobotuxomatekun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12708085335.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160913d58ae902---resafegamijukexu.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109022246122674.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bde983122affa9ab2ca2c69bf1c6f06f/lobinaniv.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/87842762864.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8b3ed800ae9363a6e46590d68707c8ed/madovugoketugogi.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/perejizole.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094696d1dc0c---wewab.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/jupikixubojibeso.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b21e3541e1075cedc22f54df8dc14d4d/wifegilozem.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717eac35586---sumov.pdfIn PDF document text
    • https://t2sc.me/userfiles/jodamajikojizuvukiwuzeji.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2745e0ee8a---79213596266.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/puriwovufiguwadekot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=persichetti+symphony+for+band+pdfPDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 17664 bytes
SHA-256: 0e710c5775d453d9d2173e25ca62e7eb3a260ad385c81e006dcf4e9c24af97fb
font_02_sfnt_off00011b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B50 11092 bytes
SHA-256: 21a46d087b41800f82edaf0367229ac9e7830ba5ad06c953df6415a83b3840f9

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