Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba6f1d05f14f362…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 09:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86ad34c50f407ddf3121619b9841ad48 SHA-1: 1653e325c2323ed8a09c70b6922b6d7c2e3a0cd6 SHA-256: 7ba6f1d05f14f3629c3b32dd68beedb29669ad9b16f4bb5e786baead167b25c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42e7198cce85ee87bc972ca166f4408f/96346621196.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/432b51711d8ae1f108b399c95f229229/48232315271.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e4acc4a6---benadufewitevixonudifefu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b558e7c31---dumedesunasexetuli.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/jagasikesotitozitemejof.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/88257111303.pdfIn PDF document text
    • http://fygl.net/uploads/file/132058495716.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bekifekasojokupizasal.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/54817548141.pdfIn PDF document text
    • https://chpcentre.com/files/file/kegosemoboruji.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zunigigofo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d0381be4485110ef57a1358d24d9182/60781456614.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/29453856876.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2210a8a33876a2ad7b7269e4a4e2409a/zenolix.pdfIn PDF document text
    • http://com123.vn/uploads/file/16788824901.pdfIn PDF document text
    • https://coatielectronica.com/files/pufokito.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/49669278106.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832acddb63a---4128956300.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/pudin.pdfIn PDF document text
    • https://olterus.net/contents//files/bizojasuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160707d7857146---22514988149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+cambridge+handbook+of+acculturation+psychology.pdfPDF 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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 17284 bytes
SHA-256: 085f8559e6583d3d94946d81902fac21443119e70129b5bb37d97795451cb4e1
font_02_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11544 bytes
SHA-256: e89cc6381001709ebd90c146713a8c1fb9e6bac0789d5ec28dc634fe2f7aa987

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