Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c35fe6b2d4e348e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 04:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 668cd76cff34851aeb825b4f09265963 SHA-1: b7be3a4a3fa117d38ede4d76e9ad5cadfdd4e5e5 SHA-256: 0c35fe6b2d4e348ecf5b317ab0aa4a8aa6bbb775c67d97d723de7126b99558b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/s25ef9c8i8cur5oo8t4h5hn9u6/83362580101.pdf In PDF document text
    • http://dungcucaytrong.com/images/files/55681054645.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd3e2d79a---sijabugemodazibuxokoz.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b6af3f6ea---fozaseba.pdfIn PDF document text
    • http://614move.com/clients/4890/File/wazudujejorarazugebum.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/dasejuxaramowekav.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kunapelinujixarudaw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6e06b6b3e9aa437a108bcd29e95463a/37237236327.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/surofovawonor.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/504fbe131908c9ecd249bd577bcfe927/litewevo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f68c91e6f77---palakovisilafoz.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nawazasaxuzedivuretofanu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d57f81698752c4e3c11a97c9b264ba9/suxup.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/kimimasesinure.pdfIn PDF document text
    • http://techbis.pl/files/file/jigix.pdfIn PDF document text
    • https://codecs.roimages/file/98239397044.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/53360429876.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/52996609586.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78099617351.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e40acf193e---xifevixefuzule.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/43062135644.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jovuzewitixut.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/zugukamitonitaloz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/235jrvvg7hiaf7b3kim0dl1r8i/jifovozeveluz.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/61937849730.pdfIn PDF document text
    • http://axwelindia.com/uploads/kowitemisekuxesivu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8cb917659dae3d5253be36472331bd75/gotobapuviwobamopanamaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=electric+light+orchestra+steve+woolamPDF 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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 10708 bytes
SHA-256: ffdb8b78923b92844194e71442b915c9bb3a39115440a5bbe599a48e847f54b4
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 17212 bytes
SHA-256: 809055409fb300a6dd95d0ec982e2f28dcc7fb65ceed69acbe86f994e8437d4b
font_02_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1