Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bc4b5ed2d40b36…

MALICIOUS

PDF

174.4 KB Created: 2021-08-05 17:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed53531c71b164c3a2f163c6a614ecba SHA-1: 8ff3faee2ff9d47987259ba33c8b8ebb97838ab9 SHA-256: 98bc4b5ed2d40b3682671590094479bc0980ba83779697276ff2e3b097d3cf46
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to websites hosted on compromised WordPress installations, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://areaengineeringsrl.eu/userfiles/files/33944484699.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8005c3a50---sewabima.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d41173208f3108e4504e7698ebd6164b/74041217162.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/jolobi.pdfIn PDF document text
    • http://thongthien.vn/upload/files/58373497688.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6ac26f0a7afb96a7df4620d3944e8a78/89483742845.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/49764626161.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/524f06160ecb41f6d6a3b61f997a7876/29202297586.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609542426537c---8845007871.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/99033223028.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/pupikizad.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/92810195506.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcac621d4c---tunaseveza.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d236cca04d---levonesupidenokexifo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/17110006278.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/m0ngfqgoh9pu289kapeonff86i/nesixebarevulivonebi.pdfIn PDF document text
    • https://banghenails.com/upload/file/kokowerikaleradevo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f977a3c49---jejinagigisafifopojugi.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/93356772498.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/917e9d880582efad6621d4a4e8f09798/51371397989.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/67392593493.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd33c29ab---92826137971.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6r2l3a2ldaer6i3hhj08ilurg6/nuxara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+am+i+riddle+answers+1080PDF 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_off00024b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B7B 10856 bytes
SHA-256: d377b96b8dd3d5c5df0003d27fcbe8758cabaec9e5933d89b796f6ac770ed55a
font_01_sfnt_off00026470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C82 17520 bytes
SHA-256: 38df169dd9a2fc6c550f9a65c4da82b0ed134a4eb65debf9f138115a4002efb0

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