Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df04f5eb2d4bdb5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 21:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13b55a667f11ecfa91554068bba1e973 SHA-1: 2c56ad150f6b21f9094d73d9a0c8d5e6c4fb1728 SHA-256: 8df04f5eb2d4bdb58f60f343723ebc8933e44124f9708d0f7948077e71f17977
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The URLs, such as 'https://inwebjor.ru/uplcv?utm_term=pirates+of+the+caribbean+at+world%27s+end+full+movie+download', indicate a lure for pirated movie downloads, a common phishing tactic. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=pirates+of+the+caribbean+at+world%27s+end+full+movie+download PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e98f0c3fa315998584c126a854b6d07e/82564093517.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608105f60b237---24851133428.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fs58oud2ikllem9r5fjm2fhgf1/69259992548.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/27559845105.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/kugepuligewirozisab.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/jimopesokujibewusiwala.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/lenujosubotakemipojatuz.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jasakuvutuselareveg.pdfIn PDF document text
    • https://arendic.cl/files/15695216904.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/15450216451.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862f533b128---nenun.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/tomigowalukaritebapor.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c141a922ddbc7bc9e47e43ae2c088525/16922674490.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/87656727943.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/99863997127.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a44c0587---73599921228.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/pemurejolola.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e393a6a732---ruwubajel.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac8479023a---58643956081.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943cc67720---xebubufarawipekapufisedi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/xexiralum.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/punideliwopomew.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o6qbkq1fho405ufrdup4cvrnl2/58456434469.pdfIn PDF document text
    • http://sieuthibds.net/images/files/nunezu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46762930472.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/69lj13aiprj3v6c14q2vtsobfg/480433900.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_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 17576 bytes
SHA-256: f2c7c7375208ecd8062d709d92e1439d607197479220b7e6a8eebcf58d28a16b
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 11168 bytes
SHA-256: 11ad44267fdd6a643b264fa5cea60df4b5c7de1d526147d609cd1bb7bdaf3fd3