Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ce8e6234f0f187…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 02:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b05bed5bee2c3a96b13e00c56890c2aa SHA-1: f209ff216b11bbc9f23969a73a887b1b93fd27d5 SHA-256: 92ce8e6234f0f1875a0a38118a4e13db1b0f50c8b3de4ad5e82422de4238ea54
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161445524407bd---38848514456.pdf In PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/2165040727.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/42631782371.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/60483373625.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/vubinapufuwurisixevuxusow.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/rosuzugalox.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ff588513---pilimulabijizuxutufuxo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f16568e---nabefototupawalotovolokut.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14199b3a586c729917e9684d35308444/logov.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/52308834726.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/raruwu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/380730369.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/73200764488.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/zagosalovakapodijujetat.pdfIn PDF document text
    • http://cycling-software.com/files/file/gesokamamovapotusozujed.pdfIn PDF document text
    • http://lovesenergy.com/file/24444412803.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/78025073776.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/getusufiri.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/fovugafijofijobimunudawa.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vigutozigusijuk.pdfIn PDF document text
    • https://defi128.com/userfiles/files/6479288149.pdfIn PDF document text
    • http://ippon.lv/uploads/File/27050717148.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h1ckckkls20dot87nmjiif0tsr/muxojake.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23571472636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=most+dangerous+game+in+play+storePDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10944 bytes
SHA-256: 259a12dedd384776cf3e60dd54180a10e3bdeed90e17da23de5cca65349dee9b
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 18112 bytes
SHA-256: c753ce7a616dd743ed519a58ab695387968dcc3e94d038a68b5d04aa90f1ffa8