Malicious PDF — malware analysis report

Static analysis result for SHA-256 40836e0529ef8e05…

MALICIOUS

PDF

90.6 KB Created: 2021-07-19 02:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec73f62a9c1641fefe5a1e9483ed66c9 SHA-1: e727889413249f6487ffe77402f5e45f6e6863da SHA-256: 40836e0529ef8e0556573bcedbc925cd718650f5850b6946d4a6ca035c1a6102
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/020b84bf118e00e3d7cb7138d2194f2b/vubefisevefetowenisolide.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06be70cc5---xenitot.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/favinexogujo.pdfIn PDF document text
    • http://megalaserasia.com/upload///kugowisekodo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xomitopum.pdfIn PDF document text
    • http://plncse.hu/php_data/file/burazeparifubidororul.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/ligafe.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2s00k34qagifom3cd475jg7j2b/64195904317.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20346d2cb6---13425787331.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce276de2a---70543107876.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xesudizejerasubu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740c917738d---revidefapumiwunu.pdfIn PDF document text
    • https://yellowstonewildlife.com/mojule.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b400010e2---zunaxafoseziditef.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/repolakid.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608176a68fba1---10988267760.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffad4bcf8---10921151058.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520074238609642.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/wivadu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/rirewikibaxedu.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/83476451368.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wilujabaganodanemeranilor.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nejue78ke8fslsmqso0elmlbrv/74935352029.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/96d80d3fc533da610829fe7935a68156/pabevupadesojagujabafib.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/18521738435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=to+feel+under+the+weatherPDF 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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 10340 bytes
SHA-256: d867d2af70cb1d71e1192aa05bd5d76f6e019151bd4b67eb109ea17fb77edc05
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 17256 bytes
SHA-256: 8f92a35d3becc574bd3fee75f640b60b3c430d0e020eb49fc4e4bea95a3e1a63