Malicious PDF — malware analysis report

Static analysis result for SHA-256 933ac918211dbf7c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-23 04:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca85b4c8c5585984dffcb195321164a1 SHA-1: f6a38dc0e70bfc533141487a8b7d96b748663c95 SHA-256: 933ac918211dbf7c6008d5f46e3de1147a130158db1556067699e092f2a726ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608549dfa6743---puzibusefomipegagifat.pdf In PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624636374_7f633beaa2.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/67637872044.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160987f9edbff1---dekosofet.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160899f19add03---biwinolonobativex.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dd4pok3ve1ua4ki5c834pqoph0/56317883225.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/xuwuto.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/gopixemajojavonilabuvawut.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/21359970624.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a1f04e465e08eaf88b6e00e824aec600/pezojuvulajutamanulezem.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51002393007.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160941891d1a5a---4267166165.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/vadasoxowopujakur.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d0e4e177e0e5b17f3cb8d0fe4e01ceaf/jefabawuxuzovifepiwu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/worob.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d874032c24---96191765720.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/av4a3ra15dfjk5pdi16bndmvq2/29842387494.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/99459904088.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/e2lr9ln0qi8k2jhl5ensph348d/17010519839.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/95154569410.pdfIn PDF document text
    • http://polipack.ru/content/file/22149454096.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/mavabubejoxivurawafat.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/60054288700.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/fizimegigamiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pagalworld+movies+download+2019PDF 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_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 17040 bytes
SHA-256: 0fb72001265cbcbab93e07c803754ea78a0dfb52d7f9981bf52aceeb3e1a2bc4
font_01_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14880 11108 bytes
SHA-256: bd140da41ea127a7d64680a7b57c7cf4d39e4833d0bbccdcdaeca6dea45fc1c5