Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e52af05d664a05…

MALICIOUS

PDF

103.5 KB Created: 2021-07-25 05:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd0dffa420b2675fca846b566c9570b2 SHA-1: cecf0c1ce9a1279ef6f129e7aada0a069fd45937 SHA-256: 62e52af05d664a054c12569b8a441a0d251bc49e3455dd33ad82ca815f1d4b56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to drive traffic to these sites, likely for phishing or SEO poisoning purposes. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vetranhtuong.info/luutru/files/zaperapifi.pdf In PDF document text
    • http://budka39.ru/files/25496581799.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gogiwududon.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/lovawixe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cd941fe242a8cabc6e897167b7293d2f/kivujolonafibudelemid.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070704152470554.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/xafozulojo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6bc68bc02f8eeab4680ed6895daa42ab/revolimozavevodi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/110b2c8a5f7c6814421eeb8de95c60b4/kubelivekeza.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/601b701f112e75f28817ff647edde107/27896778403.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v0t65ps33h8cdimohkf712i7a2/bitebitologido.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608409924a7fd---19258307461.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/muliva.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sasaraje.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66cac657---gununoxijiribodep.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/boxolurizemage.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/2643951565.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1f59sa8363bc1rr295ijnde794/tipotizi.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/jefatunu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/82305618ebf6cb6d54b4661f6c045d1f/joxakakuxubobikotefax.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210717_6143672CF0060DBA.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/08291afeb4d559b3916c37beb5d32b85/pajanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=canadian+stroke+guidelines+2018+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_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 11400 bytes
SHA-256: 35048ac7279f0c0f78438c4c04c3c22a8342fcfa198df33efb4873069df14b92
font_02_sfnt_off00016444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16444 16868 bytes
SHA-256: 399fd1957a83b353aab67f84ca872200f789ac528d256662acd9415988efb24f

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