Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6c829c8465acb0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 14:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa6598669137c8c4b21b3efd160d2a0e SHA-1: 4beb572ba17e865038681ec58d9fe22112d63dff SHA-256: 1f6c829c8465acb0cfb775c60ac6f08a939b5d68c661e8259a7b3e222087078f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong intent to redirect users to potentially malicious or phishing websites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=advance+wars+dual+strike+ds+rom PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lleoagobchcd3adi9m4jmqfbbl/todedajosekutidad.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/zilodap.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/20342492402.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090306329780.pdfIn PDF document text
    • http://yuha.be/_files/file/84664090467.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/91471331415.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/29872022514.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e5627aa5---36029270077.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/wagutotukomipidus.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050510125544.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/kevetepejubebulili.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/60768287018.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210918113251.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/vuduto.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd726ccb7---pivotarosipesa.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/tofovidex.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/liteju.pdfIn PDF document text
    • http://12shio5.com/contents/files/16832704930.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14161648570.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/pekowuvariparibumarila.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/28568380513.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rasuru.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/2865796663.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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 18140 bytes
SHA-256: 74042986c60c5ab5a8337bb92bbd60324f695c476f486729aa97b93b17fc6e5e
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10856 bytes
SHA-256: cdfa94f25b0c8932bb7e54feefb963b527c75d49e332c51803e5c9798a17109f

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