Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b8935e89959111…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 22:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5748d4e6f5aed47e9196c7fb0eb80f72 SHA-1: 5706ee72c1f742d1ea66636084731d39796e8fe2 SHA-256: 29b8935e899591111e63dff59efa607b42da3129b7828c719ee069bdd18eb937
176 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous embedded URIs point to external websites, many hosted on compromised WordPress installations, suggesting a phishing or spam campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607035c4010eb---komawizaneb.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/wudifi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/949a4d831a83fd298b709745dd104ef3/vawokatekidob.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/gisuserunabekalopu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/loluzabozipodojumipumere.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/fofiwunowipeferamupulodar.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6aede542---55508327962.pdfPDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a126cdb0---80117375501.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c57d374cd---wewekulazitozejesewexo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6698cc5f---81845098066.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/91958484760.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0759e712230edd28dc78b08b279df2ad/86269510685.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/papitesetefekopib.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tieg31baq86o14pp73g3fhrf41/funubalokofaxanur.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/73919991010.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u4t0du76kkecst0jt8judlpnsj/gebepuvonowit.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa707a25fd---rizetuzudebox.pdfIn PDF document text
    • https://topupdana.com/contents//files/61065459141.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pututugasugopefub.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b084c21f6---wonezopenekesubu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/mefoku.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1d3tsft3hchtip0s195r70n7jb/rudako.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/xetotezeronamu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82b8bf52193f5a196c9254b6b4ab598c/wesojugevof.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/99549992211.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912c534f67---gigifizoxulurokikujote.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/03a2a980fb4b6ff16639bd27e7beede4/66931325751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=qt+python+gui+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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 10444 bytes
SHA-256: eb44b055d2cf38c0e7dcd12d584a82e2c9fcb71eef0344d6bb95a2d55c02eb9c
font_01_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 16060 bytes
SHA-256: f644888d476a9fda96fad5975df6d7d5f9ea2a3e8d79718a2d42911539735172
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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