Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c36c82fe4fe466c…

MALICIOUS

PDF

99.0 KB Created: 2021-08-12 07:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 123da6703e542e466e754b7b88764851 SHA-1: 0e1e51a22fa8e2cee8f02655e86ee501b0264127 SHA-256: 9c36c82fe4fe466cb3b7a44266190a5a33467bc5b8cd3798a23bcfd8f7953995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://huntic.ru/uplcv?utm_term=charaka+samhita+purvardha+pdf+english
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984818677c2---fuverubovejesujo.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/91375952764.pdf
    • http://bassbasement.org/userfiles/file/tosexowewexano.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/868t0spf00rnk6im1orn4tso6v/77585201753.pdf
    • https://hattoco.vn/images/ckeditor/files/sexekivirowopozapi.pdf
    • http://doreenindiatours.com/userfiles/file/1941044682.pdf
    • http://whatdwellswithin.com/file/91214651703.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/tarufonojekapatuwu.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/94072239748.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jogivovuwamuxuzidore.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jfrf4lvg0fptgotc3ghhan7ec4/pezesofilasujizawikumek.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609698ab8bdad---buxunabex.pdf
    • http://superplasticizer.cn/d/files/60830857969.pdf
    • https://anthonygillant.com/userfiles/file/puwuzedob.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5aa25e4e397848d93ca0451b58dc19e1/mazewapobubati.pdf
    • http://macap.nl/app/webroot/files/userfiles/files/44071176918.pdf
    • https://careersourceokaloosawalton.com/files/public/53093487973.pdf
    • http://webatnet.de/ckfinder/userfiles/files/61703507706.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/gopefowurife.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/218bf06a9ff68bfaf0d0f12ba9ecc68e/43909982383.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/ludegatoxizor.pdf
    • https://tasleemdubai.com/userfiles/files/muwezaluzenexoranin.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b14e325a8---ruzatugodo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e83.bin
b2fcc3f58da08dcc6c9e5536a00dfc53fc1d3378bfadee2775913587080c0a93
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16936 bytes
font_01_sfnt_off00014a84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 16792 bytes
font_02_sfnt_off0001629b.bin
38038e3ffb8f3458904f6d05650e598783cadb6031b28ca993b469c895f96383
pdf-font-stream PDF embedded font (sfnt) at offset 0x1629B 11116 bytes