Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73e92d0037ff77a…

MALICIOUS

PDF

78.0 KB Created: 2021-07-01 18:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09170a62117cce07851979c0dfec088e SHA-1: d73ec6d9efeb382aef5cb02001a730364aa0c2cb SHA-256: e73e92d0037ff77a8fca24f9533f93a157c6b62ad021c256629b1ad7aa0980f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dc75ef0d2---fekasidakevojiwu.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1364e697bf---51448125232.pdf
    • http://maszyny.pl/userfiles/file/zixulowuborejev.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/58078043985.pdf
    • http://birzebbugastpetersfc.com/files/file/8376289858.pdf
    • http://korvet-sp.ru/userfiles/file/14994730270.pdf
    • http://www.pranabkumar.com/fckimages/file/kejazepowajogi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844ca0d36cf---93329388481.pdf
    • http://wawa757.com/uploads/files/refopulikafaxuwasutopizit.pdf
    • http://studiolegalebisantis.it/userfiles/files/detufevezibiwabagowi.pdf
    • http://clubesquilacoma.com/uploads/files/kawupotetariluvizonuwop.pdf
    • http://extintoresorigen.com/images/editor/63407772769.pdf
    • http://technocom.pl/editor/file/bifeparobowerobatopa.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/gokojowutibebobubux.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6b12bdc93fbe689d1fef04a6a1d37104/28694807314.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160813c2ee2cae---43178402498.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b59e1a0abe---dedosulubutiwarunejegod.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160992043c2f18---69215874184.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-12/20210612201048665653.pdf
    • http://drivescuolaguida.it/userfiles/files/50067488009.pdf
    • http://marthomaiticherukole.com/userfiles/file/terabiwiz.pdf
    • https://raiporjai.com/piceditor/file/7395388196.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kowobezeniwil.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d1eeabd9128b11d162b9cc23d1159a00/kamixuf.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/bad12d6e7876b499a9287a684d81e1e2/66132555521.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+whack+the+creeps
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
font_01_sfnt_off0000e3d7.bin
5545fc486635c9fdc73de6f3c77e9f529161df4574d8f3d8a3bd28b7a8d3f59a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10696 bytes
font_02_sfnt_off0000fc64.bin
806c914abe13fe89b254c7ae4cbddd035260220e8146e50dc57a8cbc6da02faf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17756 bytes