Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3af6d2253ab3dbe…

MALICIOUS

PDF

91.8 KB Created: 2021-09-07 23:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c2bbca17368f07b3c8ced1e4445dbe9 SHA-1: 99f67e1681d5d7971360968f6141bb562b03c410 SHA-256: f3af6d2253ab3dbefd57c3f3ce8dc148141c6259b50dcaf4be1aa8ed1e4bdd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://playindiano1.in/ckfinder/userfiles/files/23732379139.pdf In PDF document text
    • http://ride-on-earth.com/images/blog/file/tidupesarejinisi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/76829991607.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb61e17b5---falateziduvoxomotapukob.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/4566504810.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/kesinenazetutizidelafuw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071caacba35e---tipil.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/327f124a76c608e5d7785a8637c63304/96142127167.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/10940248183.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/21085236810.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/83230420307.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1be3b312a---75067423975.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/dijafemanoj.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e149b102d094846df3ddecbdea2a8d29/70554206998.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704ece5254---dugim.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/97lrcs4rkns9bpc3gnq661o9k1/503536312.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd651db31f7---jowasumudan.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fevejaxuvuvex.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f6460f40---sukoxe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/23252119efc79cd3d0c96e62af150818/tosevo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/xozevowuru.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cddc708c0f3---95417374876.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/newedelowexurezib.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f721598dbe29dcad7f7d5d7832da8f15/lezajixavavodof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=brain+tumor+definition+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_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10596 bytes
SHA-256: 6471f3ba7e91a2d18f4f1007f24e807a60bdc2ee2fd23d76e3d79680f5a5e30c
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 18944 bytes
SHA-256: 5e75efa37550cb2c5adee0909e7fc4c685d7cb86779e5000cc42ab841261583b
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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