Malicious PDF — malware analysis report

Static analysis result for SHA-256 4847dbfbe23ad7ba…

MALICIOUS

PDF

81.6 KB Created: 2021-06-26 22:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d66d875a4ca6eb7054e7aeb01f5260fe SHA-1: 94d9b6547208c3a7d3e703457512f815607c4596 SHA-256: 4847dbfbe23ad7bab5f999773a3a1f44663f25080c73b3acdf3745d2aea52558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links likely serve to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083457ecfbfc---kuvunuxuvav.pdf
    • http://asbu.net/uploads/FCK_files/file/gikaxibenoxa.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/69548733349.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/53e01070b1522a7010c82cbc15eb1054/wolusiredaruri.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ca04e68d3a0---8158563891.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5ad743b---genusi.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63aab97e8---mebusuxaw.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4abe14bef---tozikamokodege.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7443b9d1d---pezonejuvebevuzakovuwo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3a8e9428---75021748763.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e3852aff---fuwuwimunaso.pdf
    • http://bortran.com/upload/image/file/20210601024256.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad3d12986e---jufabovukasepamoni.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7e25ec9dc33bbbae79f8f8bec2b7c83f/43417104214.pdf
    • https://rh-h1tapi-turbo.com/contents//files/84582535976.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nec6ppf8pu4kclgskm1r2d4ue0/78251735021.pdf
    • http://nuitsdartistes.eu/images/file/wibulogijifowijok.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/89615252770.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9c1a38c07f5627fa1dfd4c1eb82a05b2/xozawomefoxobedax.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d64b7665e9035adfeebb7cdf90025547/92176473423.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962a9395a82---20523165987.pdf
    • http://ghalemdi.com/userfiles/file/ribivabubojuxitev.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/ginur.pdf
    • http://fine-cottage.ru/userfiles/files/59266452473.pdf
    • http://www.darvidproperty.com/news/file/25174095501.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f8477296050e52b46f2fdac485c567b2/15910266319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=if+a+and+b+are+two+positive+integers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a8.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 16088 bytes
font_01_sfnt_off0000d8d9.bin
7ff84e0ddb641b1ad8c258a0bbfc3c87f4447762aa81afaa4e2db08a2b20c984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 17500 bytes
font_02_sfnt_off00010712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
font_03_sfnt_off00011f29.bin
f59787facfd7fd2a885ee60bf3cee3b625163586819ac998b4b9208d26777d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 10872 bytes

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