Malicious PDF — malware analysis report

Static analysis result for SHA-256 d919234fc4baa057…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 07:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bb6349145b2064f22ae0627a4a7952c SHA-1: 2e0a6b64b5d1ddd3c05d0761bb8f32cdc02152a6 SHA-256: d919234fc4baa05799580eccffa3a3b85c057bb067baa2b659e908005db1550d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://enjoyisagenix.com/ckfinder/userfiles/files/tepuvugetezedugoxoluwakan.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hkoqra8c2uqmetup7l8i0j4obn/murezuliga.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodap.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pelawobewolawof.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16131200e87b7a---30291839433.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/9782136789.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/52676187747.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372d5ac0515---46802420553.pdfIn PDF document text
    • https://auto826.com/uploads/files/48092289470.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_141136_145.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/vodikiraweri.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/puridesuxelofedakud.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bukuwebuvobejotafagubu.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/37094631181.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/sikefabunudurefojuxoga.pdfIn PDF document text
    • https://projetovm.com/uploads/files/31603506199.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614547ae56884---4159725490.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/61886987383.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/21281128680.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/81566182603.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/vadotaresibukovaloribuxip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+unlimited+data+hackPDF 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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 10516 bytes
SHA-256: 5739a6afd7d4ba1149952498e078888dc8feeb0ea8374194bbf13c4de706d925
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16280 bytes
SHA-256: 6facc56888ab9ea9d690d8cc28ad90bdf64bc2b058d552ba6ba6c4942162995e
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1