Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eca9cfe29bf654…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 00:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc6cf9bbbca34ecf0ce2965dee113774 SHA-1: 231e73fa5ce09d70a18ca2fa197cd5e0988219ca SHA-256: a4eca9cfe29bf654fae7e0d9b55e35e82a41d301ce2d75d44c61e4ba8978e2fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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 https://garglob.ru/uplcv?utm_term=exercices+de+conjugaison+tous+les+temps+pdf PDF link annotation
    • http://wojno-stal.pl/pliki/file/fefomofapobirigek.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/241911419540.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/21802777933.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/16101d17a2bb8c2238bb03a8ce9a80fc/17855467073.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b5e998c902513b1cf5bcaf9c2fd711cb/30348036764.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/wixivomo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kuselin.pdfIn PDF document text
    • https://datawire.gr/files/files/44480936793.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210830_3E2729B005C8494C.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/pavifofuvew.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/repuxanesepo.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/wurutawidibajunumozurevum.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108241043221670.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c90f09bab966cd17592f129dc42288aa/juwojazid.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pjjlmc6idsfrrsrrh7rk2h8fj/77040616643.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1508f03716---45912792555.pdfIn PDF document text
    • https://dm288.com/slicice/file/11566183669.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c426c2104b---wetalim.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d26936e8---gopazemas.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/sogetatezuro.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/wowumos.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2873794801---kowefokop.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/55be00af2c6d26cc6bb33782172088f9/jovutituxaperuj.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/zemekaxivubirikawevitonun.pdfIn PDF document text
    • 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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 20748 bytes
SHA-256: 653774955b3d6299b016ee9d86c6b4e26ac5d553a137fb98e4b64787a486acfa
font_01_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 11276 bytes
SHA-256: d5a5e352c8158d6c71288002e60130ed7e26ac944ede4ea16cb873180cf30983
font_02_sfnt_off00014889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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