Malicious PDF — malware analysis report

Static analysis result for SHA-256 915dea9bcc86d5c6…

MALICIOUS

PDF

106.4 KB Created: 2021-06-19 22:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bec54676c4d49fd3391d820a17febfea SHA-1: a8aacb01fc41a36572d50c6f872d4695dd34a101 SHA-256: 915dea9bcc86d5c6058e297a3d9ff91e5033dfddc8c8b9260d25c2709161b01f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a subsequent payload, a common tactic for evading gateway security. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/66851fa8425ac5f4f957be56eb0c5910/3570370718.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/400ee0bca942a49c6cc5aef5bc1e13b3/44739064890.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9beafa7a9520a8c6b99264fbef986584/malukutopinuv.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1424d7686b---62056466223.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/nawozejozofesowewijofoto.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8kj2d02m6gvvscm7gfgvksbiv1/gajoloredukasapudapisita.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5124ba64---lokek.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608185c07af0c---42941530408.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/66279112456.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc13dcd96---92971659793.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bitorasezarabaviluguxamaj.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d1d23602ccd8991322c7794d39af4dcc/vekibolex.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/relinimarawesuzelob.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bkkt0dddtbtgsoegvbc2jqaikl/77697693413.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610af03e51---97885984189.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5c6cjt4gk6v6qm9dcbbgl72t0b/jerizovafuk.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15cc62929e0272e43b00264efe2ae1f3/vuzafoli.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087209406e73---17657102853.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/jewugot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=operations+research+taha+10th+edition+solutions+pdfPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016991.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16991 20388 bytes
SHA-256: 75312bbf5d9344a755ee095dba4610ea26b1ba748d9f1e56ee1c9b2e67474961
font_00_sfnt_off0001318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318D 5348 bytes
SHA-256: 474b036c875a0030f596a015f54477e0d5f88695baeb523c491b582a55a51db5
font_01_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 11172 bytes
SHA-256: 00ee291f4a71f94e981f4ecc4f527ad1911e108e9a5f68b01ec7b34286c8b67f
font_03_sfnt_off00018b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B50 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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