Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80d361eac872157…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 22:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b9980b539e42ecd8814a52341a16a3e SHA-1: 6f8254acd0238b64f6f11f4a7384340ef3d2144e SHA-256: b80d361eac8721577bec9eca40e6e127d850c267a3aff2e23f588569e2ee621e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically points to compromised upload storage, likely used to host malicious content. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=difference+between+aardvark+and+anteater PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/42e6633143710d06b3e2e856b16c3433/12155957529.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45adf86fe191a354c8a8121e84c6ec15/tawitofudanezodelidojur.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/zupoxebes.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/kabarafudajeleziweviw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d956409cca4---15489989735.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eqdb13o116dkmnbf55l5v7fk04/sitekovaf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe461dab7---zudok.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160786d30ec25c---bebijijel.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cnkisvsjqc25h8b2njjtenbvld/pirivibu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67fadd010---rokaralerabemot.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dbf9743c7---lejarukirisigusesidufe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd7de08b1c---vupizaxarakonoxikomudax.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768fb08fa7---lilinizirit.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tituroriruregej.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/jetobujizotenesupo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b4a42d7a985eb33edf0b431e72dc5f24/gugenijedajuwowi.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/ginitileve.pdfIn PDF document text
    • http://jkohut.pl/file/59647427399.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ba1e7c811f332a6bfbc9d64e81e593f/52385431997.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092828e6585f---59633016204.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/77152031568.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210825012012.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/zogeporojagomivujek.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde3d4539b---42873223275.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/pasejixasorub.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_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 17060 bytes
SHA-256: 4aaf519d2790ea8eefe2a442aa3492ccef104a1dc8f30ff30e3e71eaa9af3247
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E2 10520 bytes
SHA-256: af97506ee6c0570d4b68e566c6a1d7f0f57472528f03ad81f05b580e6a1122bf

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