Malicious PDF — malware analysis report

Static analysis result for SHA-256 89427f7654262fad…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11636cb8010c06e5b73f5ee154fb52fd SHA-1: 120d02b21041d9e62f04d3269cf49830e9262fbf SHA-256: 89427f7654262fad7da92a4bd6e2c215f3fa61735c04e13508ad1a06b3450573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9866116bf5---sumog.pdf In PDF document text
    • http://ash-graphy.com/userfiles/file/ketid.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edebd89f3---xapekemaxaporixari.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1348d2b10c920180c801fee6fc2ac9f8/rututik.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99c8adb7d---91975199166.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/mazubanidoze.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7798e0e5---godix.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add396e9aa1---5122325172.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/95365c8ac1ff4d290b78a7e823ccc570/84713818664.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ee0925b8---nekujopumopiwutelafa.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/bimeroboduwawid.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/61792794658.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/22347305557.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33092acbc---44928201424.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/leduvorivavixufijivuk.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983e0e01beb---44645970649.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffdb42d2e---43102224140.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/32470620606.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ac4efcda8089e140b77baa6d1601ab07/xijirogasokejipovidu.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tesobosobikikixojitufiw.pdfIn PDF document text
    • http://thedreams.cz/files/nalukumixazanosukedab.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d88d8d5ef---lapoduwasowopulemiwe.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/da0lg1oqrcqcdjcqo7iluom0e3/60808180080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fitment+in+a+sentencePDF 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 10100 bytes
SHA-256: 4637f48cf0f92ea29110ca1cc880c7f7984df523bd19007db90a106158881f41
font_01_sfnt_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 21468 bytes
SHA-256: 55add697a8042ee2e6b5eaa7fd846d9193ccc81859ca7610c003e5ed90453a3d
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 2356 bytes
SHA-256: 1b01faf076b55f6851807c812ba867a0bb832fa66619f8f8548b9701d384ffac
font_04_sfnt_off00013fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBC 16564 bytes
SHA-256: 5fb387001f9d48864dc6372efa19b176ab9cce722eac2ae77f7a12c1f76bc1ec

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