Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef0f3baffc6e1db…

MALICIOUS

PDF

86.9 KB Created: 2021-07-20 21:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 847df7a3ea6b9454f6721a5da4ced168 SHA-1: ad138c586b987f3e69083d4b7647a15d06975d09 SHA-256: 7ef0f3baffc6e1dbbb0cd9aba3d56ccb9b82bb4f0b36231264f4fe9bba8f41a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary attack pattern involves luring users to these external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2pras3rm2lj48162q3ersuet3/50918181931.pdf In PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/62033677161.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4adf593fcd---92418310793.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/688da7d21dd4d6ba01e12dd5ddccd080/78854618798.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/47351501625.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/51729953783.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/63886826594.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tt1g3aoehdmpsloldj4i9iug9h/51325054202.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e946947e82e95ebe8f401d2fadf3118/fukamuwemupuzeda.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/gapumumimorefafobame.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/hr9i4dkq3rj6a8mun3ii0rst54/dubelesepojodetikediz.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/20600848414.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f4fdddeb34fc36de99a570f6ea1539a7/12641168586.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40692556718.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de64b3657156e90f05de0c81bf71cfe5/45465449552.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/44576249145.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/54503015419.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeecb57ace---gufemasivosigigejov.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4a1d9b54---26087189705.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210712_211648.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/de590a68184617f7d75be9e02da59b57/14378712715.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0926d90c1d---31082341466.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1598498c15f196b51ed46a8546026e91/15011569812.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90dcddc35---lazemibegofimebinane.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6b9307b67983a0168067c829f3b21a1b/54600183091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+disagree+with+youPDF 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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 17044 bytes
SHA-256: 109842068c042de61bbef2cc0d56c0cda78d6cddaebf86db67469b533dfc9104
font_01_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 10628 bytes
SHA-256: ce36aeb07fc20c2127806ce5bab12f60fe59d35ae5f5bfc1f31b8b3e7d8b4b8b
font_02_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1