Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23b508edfcab6bc…

MALICIOUS

PDF

100.8 KB Created: 2021-07-04 05:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 920e7528f23b7b4185d593be30f7fdf0 SHA-1: 8d8026ef360c6e0d371ed65427883ded17a0ca0e SHA-256: a23b508edfcab6bc821b0dc8df073cbf6d737ea5040f8fe15be8fe3722c81cf6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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 https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2ede9754289d482a4304289aa96c21e2/wazafa.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b545bf39055---11315642063.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7bd17eda8f6a2b4f744119617eab1ed3/26914257538.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/1277467204.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/pawexa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2299a9dd8da1f6cc49df931ccbee7b13/bidojirinazirobeloderew.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9311c9ca---rigigoveveguxudafipet.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/848f9gfua00dsrpij4qctvpt71/7354021247.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a104a6887---21092030168.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/55c8e78c18a0a1a5742a4719305dff04/13648063271.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/14596096823.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/36661608245.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/werefibokikatasumopuda.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bugedijimujadorasefitu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70729d950---15895195184.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4b52724f0b22d98bddac7e97d6775726/91441416523.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gurijuripab.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd9a98615.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nupejitele.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/56365759584.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085448b4993a---88379448064.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/bemonesinipe.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s8bk38bvtvsk9rfsri20rctetg/7915325344.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8adf0832---mukusuxupanowe.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/27459187467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+cynicismPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10616 bytes
SHA-256: 86b2b66603e4117367764df6703f2b37984fab36a2806fe7d14f7a2e0f980674
font_01_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 19548 bytes
SHA-256: a9dd0e2879a05a181ec758c2a141e6e28e4a8556c64bd8dfe69150aa0d4423fe
font_02_sfnt_off000147ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AC 2848 bytes
SHA-256: 4ca19c5509008ede0f8ac84271ef5c9d00dcda468751b03231f736abfad031c2
font_03_sfnt_off00015374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15374 16768 bytes
SHA-256: 5dadde1bfc931dec839efec966134ecf3a00fc7793cbe3fba608f958c7d3b58b
font_04_sfnt_off00016b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1