Malicious PDF — malware analysis report

Static analysis result for SHA-256 130fe8f06b5304d5…

MALICIOUS

PDF

89.8 KB Created: 2021-06-26 21:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31c620788e7b613790f43b3ab8c13144 SHA-1: 9b131e2ebbbf7f81af39ee1c5444768bdbf0bfee SHA-256: 130fe8f06b5304d575a93e6c85da4fb81259c523e98107e865cf7026e0dfd103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c13394a35---28035719112.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c95cbb1a7fe---fikatajagopazujeder.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/reksnajemug0lkfb45e0j7hkq6/16273963557.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/fetofuvawo.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ptdo354hhk3j6a4u8jhqmh8oag/87324961120.pdf
    • https://evergreencans.com/userfiles/file/jokafavavolinalo.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d86c7f670---zafigir.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/54omur5g49seerjm1rsf7a214g/manuxoxal.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/kawitupa.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2557a6b134---jukenin.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/cfvff3q264f6gsr4uhl5dbq2t5/7273341266.pdf
    • http://rajskiewakacje.pl/userfiles/file/digorajodinexu.pdf
    • https://silverwayshipping.com/userfiles/file/difukoxorebegenijawetom.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789e94428cd---93091671372.pdf
    • http://tulga.ru/editor/files/1148938432.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d30100ab---16876056290.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/09a70d1c275cfa9d4edb578a0ef16f05/1336784527.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/nezipoka.pdf
    • https://amatnieks.com/pictures/image/36935137903.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/girrmn9avto25hivqstmr88m76/tudagakapar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=graph+of+increasing+opportunity+cost
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad8.bin
8d1e051c05cf901b564f9c5f719efa053c97e11197478a30740dbb58f3a4135d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 10968 bytes
font_01_sfnt_off00011453.bin
f76865b8e098a40b9d7b6dc99a150ee1a81329af04b281b16b140a51c5648492
pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 17584 bytes
font_02_sfnt_off00014210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14210 16792 bytes