Malicious PDF — malware analysis report

Static analysis result for SHA-256 1861f90e9639ffb7…

MALICIOUS

PDF

104.2 KB Created: 2021-07-18 09:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fcaf66643c50f89cba41f3b105c197cb SHA-1: 288ea74601da3fa55bfa0a519835ce624e975985 SHA-256: 1861f90e9639ffb7d2cb10fd05dbe06f6956efbe7de3cc7356a6493ba64e82d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and numerous links to external PDF files, many hosted on what appear to be compromised or disposable domains, strongly indicates a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this PDF. The embedded JavaScript likely serves to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anthonyvienna.com/sites/default/files/file/83961780835.pdf In PDF document text
    • http://mu-rrrc.com/userfiles/file/kadelatijubetutadetolemo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6009f66776---resonumumonaxavusubu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/32278512184.pdfIn PDF document text
    • http://beiks.info/public/file/8307237074.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vitofi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/25458116810.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/43929176155.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/gararilu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b769ae37---39064406318.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2ba6b88945825fb3b2b410fd735ca1da/41217230876.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a9223d72---55574918142.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/30ab777b2f0b01d83bc8770a6d26cf5c/28675299851.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/62725131050.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/95493837104.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/469f1b29a654b1e1c17b8c91c8f35a42/41444882283.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/85c8d5b96e6de995bebe1d0b4167cc1f/zubuzozobo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d912b79cd57---dekovirudewoxo.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/92886888997.pdfIn PDF document text
    • https://85097781.com/upload/files/bejale.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfb16b642---15934171985.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/3369609759.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ec649c6aba29a778d3fb7b1b508592d4/gazegenixisojujudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+blow+a+bubble+with+bubblegumPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 10752 bytes
SHA-256: d3a1ab088e4f62a5ed9d4c5c023a93aa40aa1622ab2cc5fbb149e83a95fb2554
font_02_sfnt_off00014a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD6 19280 bytes
SHA-256: eef6b5c7eccb65f128315d1998fe89ce30dc70a570319671436073845c30c35a

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