Malicious PDF — malware analysis report

Static analysis result for SHA-256 45953d5bb4b5ec4a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 20:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e006692e0d7db03a80782a9bcaa8395 SHA-1: a33a001638d824a1826016ece5ccc262fb4b518b SHA-256: 45953d5bb4b5ec4a22408d3e2246f4c4593c406248578659c47002a30205d32d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=breast+cancer+pdf+review PDF link annotation
    • http://mtsp.by/userfiles/files/36798595398.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a9847b389b67341685d29ef35347/12669950170.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb8502bc7---gexigigasejuxato.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/19059448141.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/21873961569.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/21072915270633646715ov116ay3ft.pdfIn PDF document text
    • http://masonhn.com/d/files/56109713145.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1c538b1a84fd315aff4454bcb6035e74/zuruwulo.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/rusilofatugagupigom.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/biginazirelir.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/jatiluzasigun.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/busugufevafapejeporabuxu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1946c2ce55---8693617075.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/dubaduvebadudawep.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/51547131424.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/23839585975.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/118dc28513931691b275d40afee0a28f/koxax.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6458e8860d25dcea07c95d23412669ac/82210583209.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51686085086.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607649eb62db2---20555539008.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0185eaf0445980b78966e159868630a9/99569239661.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/4789386463.pdfIn PDF document text
    • http://ruresept.ru/files/file/10598501911.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/dd980457b836fc087e8107ec679c5a96/62700062029.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/womabawosewubatisogul.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_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 10652 bytes
SHA-256: 3d08d9daecefbcfb83b9c8203043dc47f42e73ce8d8185e60de80ca59ee86102
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 15624 bytes
SHA-256: b59ad3d8b9430b0cc960898d19f50d3536c27e70c59c28adb9b04fd03cf64691

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