Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff50b7881ad2de76…

MALICIOUS

PDF

84.3 KB Created: 2021-07-31 20:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6bd36d40e19431cbd019113272e7284e SHA-1: 6c840bec8a405427a48bbdda9fcef6491c06e589 SHA-256: ff50b7881ad2de7629d015964fd2e26329a600f8de52cd3acf2dbcb80aaaf8a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript, indicating an attempt to execute malicious code. The document also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or malware distribution. The presence of embedded JavaScript suggests the execution of malicious actions, such as downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://readandenjoy.ae/userfiles/files/7390259515.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbc95640d---92307438464.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8874ba35976a04ff5038c3de76cab88c/muvolidusemedatifofudete.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db64fb6c826---92051532423.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/051bb09ed004ed11eb3387946eb463b2/50174427219.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/68650961173.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f020a35c67---pixisipewef.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28cdde4d0---balebiwilufuzafubijafixiz.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/11630014777.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1627129835.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41191131470.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a203b6b36fc---96579424706.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/60521463271.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/97382123696.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/35466117479.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/85609317105.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9aa7a8eb---vedititetinewikukilovetiv.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/58919957028.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/643239139d376d0351444775704fb917/77151160440.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mivupaz.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/65aa8e56ecf2ce025dd25cfd52617f2a/tagerijinuwuv.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/kilepobinu.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/51503443969.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13335803509.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/99833436389.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef773f7f2---81628459882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=skyrim+high+resolution+texture+packPDF 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_off0000e41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 16984 bytes
SHA-256: 6d40cfd83efa018913ff4cac323c0842b76bef0e074314cc3aa3de4794a98d4e
font_02_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 11304 bytes
SHA-256: 9c594a3587dc4a0aaa9eecc59ae3314b4716bf834a6e44ebcf1fa8f47d71b0c9

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