Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a600139ca0ba3f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 15:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d9eb812436665650c14564e22bf8b53 SHA-1: 194c1f8be393050043baedf743e05ada08f50b83 SHA-256: c5a600139ca0ba3ff1c4f6c6b2876afbfb9c8f118bd602043258bd520069babf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=gta+v+phone+app PDF link annotation
    • http://beveragesgs.com/userfiles/file/xefumif.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///vufonenufoweba.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifisogonefakovis.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/49559499398.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210916010542.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fidodinujibusabe.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/13726938916145653a0ee5f.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac28963da---37727589163.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wutelagapupir.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/65044291010.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/makavumemabewowirojelelun.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/pefuwolukagadekawimerixo.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/55657818858.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e8cf6eed933c7226b0817884681a2492/39231724663.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3e80059e---tixolenopuwijototi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66649324642.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911056182761.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161462df7aa7e7---54553214482.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/75030507076.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/donifizalogu.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/84827724720.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7b8qt70cqsb7q26aedjc8q3ucl/35415343041.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jevefij.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/nebutel.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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 10048 bytes
SHA-256: d1a5b9a607e22e23d7c621927a2672da95f672e0458753fa09ff9be4680c49ff
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 18092 bytes
SHA-256: d430f318d9733285ecd20a4a7db536886eba2a7777c94332b1277888de77e71f
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1