Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9342fedc8e9cbd9…

MALICIOUS

PDF

106.5 KB Created: 2021-09-03 01:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a233cf569b4d1b69dd634e4d25be40f SHA-1: b1d54f49f720cba3f49b71258ebf680e6220fb41 SHA-256: f9342fedc8e9cbd99df3fdab8582b6dae633569d64d92964eb90e9b6e6535aea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://flooroverstock.com/admin/userfiles/file/gumupowogig.pdf In PDF document text
    • http://zamel2.pl/userfiles/file/sifuxuvolelawutojidapakew.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9780e209e1a81cf98589714f80076165/jojegodiviwegamuxiraber.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3a33ed6cf7d0c1b9b8b9959e539da32f/fafujilodelogotot.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c045ddbaa8---favofalofo.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/41961289838.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40537927111.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1uqui2b17pdeighkjj11ju3af2/rubusanipisitinosawa.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/36522415881.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/nemaxujufaxutat.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/54332880320.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076584f0ae65---xalupavirodewab.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qdrpigm8011c9rdu694dbtq520/dupum.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb631a849a---83769409351.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649df1da44---75607636442.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/40591171982.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fb708ca7---68428991738.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/mutuxusipu.pdfIn PDF document text
    • http://vanhacollection.com/images/files/86088219226.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/wafupeperidi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a2f281d3---dofozorigoruw.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b025bef9d---50431865599.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/sifuvemukulabopa.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/001913051eae8f2cca93763f80a5482c/tozifipibabawitikawugeteg.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610859042d4b6---disebejebi.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/85414827754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flat+earth+map+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_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B0 10256 bytes
SHA-256: f9fd6262d71a1c7a1095afd317e1c775eb38a8839d9ea6942d9fd1e98066c68a
font_02_sfnt_off000168ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AE 19924 bytes
SHA-256: 410304d6746a09e22797fa5d29f8031228b32bc956ddedfe7a85655d7d9a27de

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