Malicious PDF — malware analysis report

Static analysis result for SHA-256 058fb53eca575f77…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 10:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 48515d7a897733e72543b3c2002755c5 SHA-1: bf03aaed9a4a129c1c77ea958f77e7b017169519 SHA-256: 058fb53eca575f7735590d70c223a8eeb051e9bf700382a1229417fe9694ff6c
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users through these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://saothienemb.com/uploads/images/files/fijudibav.pdf In PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jisifavadiwomapi.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/49650709875.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/funupi.pdfIn PDF document text
    • https://777mto.info/contents//files/53044327686.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sokimebesutalipariseg.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/46597557948.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/r1615hajd0nj4bcttind290q85/vogiv.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/40928864166.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/metigegalodunutujilaseti.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/44428607676.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/75193847268.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16107ccb380bb4---povulebuxerogapipasazize.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivifaxomosisipojunomew.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/71579180958.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/76399097265.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/jujimadewofepudafo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/xisutowabitu.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/zadof.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/lujeger.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/nazuvusuvufugusesunigos.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a970c7671c2---kojilik.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/23041853456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nirvana+heart+shaped+box+tab+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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 17000 bytes
SHA-256: 7ac6966badf5ddf5a256a56b8ba5452bc25723df46c48897468de02e4137d5fc
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10836 bytes
SHA-256: 65c4c643924d4a7b040d92b094bc6e38417630154efa10ca61a22838f1970e8b