Malicious PDF — malware analysis report

Static analysis result for SHA-256 df009f266312cbae…

MALICIOUS

PDF

83.9 KB Created: 2021-07-27 13:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0604b8d6f29096743465f4564f20f8be SHA-1: aff11520d325a48136c242dde9da71dbd147ff17 SHA-256: df009f266312cbaee4d39bd57ffc94a3d5044ce1bb27762ce13126d9dcce9c69
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5610

Heuristics 5

  • 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
  • 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://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609885e026d31---nipojixuve.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/409cfe92af2add4ce944609d2ba9370f/nifupoxobafulipez.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ceec346cfd370e7a55984bdd75f0559a/85219112338.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7cea46f3---48308142305.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/34lag31h0ajqvf88sg26409dml/nezokarasologa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/404004e83ffb78a849f6e8661f2e5e07/99989480471.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e085edc5c6d8bb4f3646265c645f6f88/potebimi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e905386c013d961ed02e7111969de0d5/xapupagubixolamurazapenuz.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3e834c5e80440cb5da911fa544f7b9c5/zipivemilabinekefofoz.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/fumobuvabixi.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/39642936738.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/toxatokobebatetabiv.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210727_062733.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5c2875ccb307f10c24e2a8afe46f6776/gavajezubojemexefenaxixe.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/xivevala.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a001f2287---pifafasefonowitoz.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/karunixozagipa.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lunefekakof.pdfIn PDF document text
    • http://izr.fr/files/79279797105.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6b6a6be3a87ca2f4d10816091163501d/katewewaxokujepi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160860df4d55df---gesureruvixami.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/86756142173.pdfIn PDF document text
    • http://nature-revive.org/files/file/12407221542.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/78129c7cab7efae6c8838c3ad9c8fb76/zanuzi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51c37b0f6---32734570924.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78021214475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=flowers+for+algernon+movie+1968PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17160 bytes
SHA-256: 6cc90dd3cfcef0bc32aaea81af6e3d9e6ca4c79f05141c733e60fb1c2dd193e3