Malicious PDF — malware analysis report

Static analysis result for SHA-256 52999872ccc74ea5…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5de6dfa01f9ea4f336092bc1e6d8ac6e SHA-1: f9f7bc76bbb6f7f25c77770bbb837fcd3b01d537 SHA-256: 52999872ccc74ea5a6bdf19bc2bb2fe62dba5072bff94df2e93468934fcb3f7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de54ec601ad.pdf In PDF document text
    • http://lineshare.net/upload/files/20210624041636.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada0599a49---zapediwu.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/29589741767.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/seborebe.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/79673760056.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/3a80f01b43f46a40529cad8d4dfa35c2/vitoxorumurogelifubenim.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210626215544.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/40cd3c4f845dba7b1abbf3637d668e4e/46883811236.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/17172306399.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c02d33328---wurefaje.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/26357856288.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/rcmqkarmb4pn0v88728uj90vaj/lalamaxukogixuxatiluravum.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcade926f---fedusexiwasipomaj.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7e573aad3f939dc1fab2b476b926321f/tedudutoxoxezitaragawo.pdfIn PDF document text
    • http://isgsrl.it/images/file/37444814327.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/vejadezuwokekevumasigug.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6aff7e9672705611a42d3267f76f950/555257130.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fafejamuwekupigalev.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/4752772ed88e289233a1d3c59cdb1201/vozad.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f58b535894bbfc7efba3852e681c4a6/74562096424.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9a5559edc5d9664a605a73b45b19819b/pixefevenerofumaka.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tlr8ml3gaah099hnsmktdsgfie/70272082173.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3583430571.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/44aaccha5g9alsqf9nkkqgpkr9/91921875738.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8dbc9c6ddd7d6ae1693fc53621582fa3/95361108180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=thermal+radiation+heat+transfer+5th+edition+solution+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF885 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_00_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16272 bytes
SHA-256: 00ecf552737ec4bbcec9408f58fdb5354f44c5527ee9d0c35abd884ad24eb902
font_03_sfnt_off000145b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B6 10816 bytes
SHA-256: 394e6f4934bd5520ebce3ddec7bea9179845779b99e30cf2cace89c9721c3620

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