Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4536b2278cde3f…

MALICIOUS

PDF

103.2 KB Created: 2021-07-05 06:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06528646e0257e71c09f75c7d55ee46c SHA-1: 0de80bfc4ea5d7e1585c1734503ac4d2fc644718 SHA-256: 7b4536b2278cde3f262b160bde2ef430c30c9dcc6fbb1feb381d571f2bc423e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c605f3bbe85---dizifofiser.pdf In PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/dekaxegafimaxusufabivele.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/40650512874.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zukubomumasebejub.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3c4bb5a40cea29a2a7765171fdf930e/dowupogutopijuni.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1460877ba---gagurakopamopasilu.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062410105673499.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/nixibusabodugagodajunipot.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/kekazebiginudirutulol.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2bed9061---20927592525.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/koretozobife.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b48848c---weketupimawujosusomiju.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0e9f86edc3d72b5be255a889fe7918b3/31797716391.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974510c01aa---fogorufuxexevomipajezen.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c185a874b61---85841715386.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ri3hhl1b1q34a2qnp1g593bvm0/16561152814.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e483b35d46---vezujafobapomixetugowifad.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d916b37e0ae---pilubemovibejusud.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/58qbajlhv7bvavgg1cm0rf8jh7/15601200763.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/kukabi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/48e32542743315614ab4f871f9d49aa5/vibeledu.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082800338895---gitof.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/12042364546.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6h6qtl5u5obhd4kjhdqvi3kgii/72094487929.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4f1j0ab894p3b4usvor679684v/45989237304.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c0799a5fbf7---51741481143.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/slf7rfvknb3i0p6qtt365uhla3/41231637109.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035cb9e3d5---rolilitusesomabibusumamup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=riddles+and+answers+for+kidsPDF 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_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 17264 bytes
SHA-256: e7a8ca581ce3ee817d60c9f37180e52466ef10f46f39c4a51eeb6064c293e820
font_01_sfnt_off00015f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B1 10472 bytes
SHA-256: 18ad2f7c37704b164fc95ca15bae2371540740a3a53a5aebf212aa9cd408a939

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