Malicious PDF — malware analysis report

Static analysis result for SHA-256 6476a0ce570d753c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6eb281665d9613453ea45c236793daf9 SHA-1: b7d23a80d596c1cd593dbc0051251b706011bdad SHA-256: 6476a0ce570d753cead65f140bf6d12109c1fd7ef5a26c80791bfc606fa14cd2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yeosingol.com/FileData/ckfinder/files/20210910_D863A60F59B56031.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9mhauh36bdeo2qbeighd6b3ibo/77127819427.pdfIn PDF document text
    • http://allycatering.com/userfiles/18703528099.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/34314412771.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/61515947178.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04e48f74b0948201e5f9ee64de33ca07/54085970744.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/55057652014.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xenofugotusajegepikuxibi.pdfIn PDF document text
    • http://hadt.vn/upload/files/manulifalix.pdfIn PDF document text
    • http://ruihuitax.com/files/file/pikarunofuripigur.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/67543946918.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vuvekejapu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475f0eefd11---80513961207.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/91100342815.pdfIn PDF document text
    • https://steammining.com/userfiles/file/9202548824.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/badufakosuf.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/38736909965.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fefefirujosamibagizasabi.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tofuxitilikozagodoponeze.pdfIn PDF document text
    • https://electroagro.es/pub/files/4674330785.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/45638972258.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/63692328660.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/peminekanixiwujavobin.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/58919500705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+games+for+phone+2020+freePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/19309354848.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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 14820 bytes
SHA-256: ef571ca2775c4a0677ebf6388d7bf1b908dade8d54f8704b514a0f6634e0148f
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10960 bytes
SHA-256: dfa28e966a56b7663c182a4f1d8efe524bd6a2c0648580dd5c85bd685493eff0