Malicious PDF — malware analysis report

Static analysis result for SHA-256 811df1d28ebcad57…

MALICIOUS

PDF

82.7 KB Created: 2021-07-16 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3c02021c3fbb034857c188ebfa1669a SHA-1: 1b68516567867a157edfe9b4f04d5eb05d0656ba SHA-256: 811df1d28ebcad57377322c86af2f01134215c8f04ff9abafade83361cf80c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress sites hosting further PDF files, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7932

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca254e8f13---zedirujojanonazotela.pdf In PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/2769060339.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7c561f0b---jikedijajexapadoxesona.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8be010a95b---77087149907.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o76752r9n7g9dtmm53umt06b67/runizamuporufewegegupipe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56e3b6c54---xivab.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/36548709305.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1c296184---11016668555.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/29197935553.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087975ab489d---nilojufaremutiv.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/89878476682.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/11906426212.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837be8b9caf---vexabe.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/34468487775.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/mimeruredixogokenulelis.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/c0e9a8deb5cea6fc69596c2fb51eac21/xavijutozupasijor.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/568aa8be73888c1bc8a9c7536a2bbe18/gixevevasutijolopabirox.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22674255061.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/40961341114.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072086c01458---68266982724.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/27278616814.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/81867418229.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efac1a2b2---53745605546.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799eac8c1d0---winobotuvetemokajaxiwevu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f08d4323---fijobifulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=according+to+kant+what+is+enlightenmentPDF link annotation
    • 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16120 bytes
SHA-256: 6a0b455519773d07e0c636bd2e214faa53c39d02ecd17fd1b34f5ea9c89ed188
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10976 bytes
SHA-256: 2f979ecedb6ecbb01fc678b1e9c1086aacd51bcaf62f8eace6f9e71179c8a3d0
font_02_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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