Malicious PDF — malware analysis report

Static analysis result for SHA-256 baecba22d99ffa6e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-05 04:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b533a0b1a348d266fe82d7c970d8d37a SHA-1: 7bd1fd5b1699eee18a35064cdf857d84700d15bc SHA-256: baecba22d99ffa6e4767dcda5a889c85dc9bca0b27c15b038dea5cf34c91e999
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of multiple embedded URLs and the detection of a 'Phishing.Trojan' by ClamAV strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/55fde3ad50d6792e07a5a9e8e94060ed/pifelejesinufuburaditubij.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be4269b86d5---davuxigateforesel.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d47793466397f4e109669968f94b7538/92812658453.pdfIn PDF document text
    • http://ashioke.com/images/library/File/61483600986.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ea8eb4e7---57134516337.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xejuwusiruvu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/81886876351.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088947023cca---41012802956.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/sasidewubexi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9d3fb8939rnih983a6mi6o0phq/pupilogewopegal.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/wivomifovokemesiperopew.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/9709681450.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/87357753415.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/fatul.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6181ea10---leseponanaxixuxipub.pdfIn PDF document text
    • https://norservis.com/files/files/62151582904.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/guxavemimifikedu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/26747225710.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/j8q77sqd6mfru755je6cna81a2/xuzitolosizubidepugojama.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4361d9a4---kefamesovuturoxusilizal.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/lupidonazefaz.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5c93a8ce4---samegikowajozo.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/99130290388.pdfIn PDF document text
    • https://jetaime-shop.com/files/16117989355.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19c1bc6bed---90070709761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=child+vaccination+card+india+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10516 bytes
SHA-256: 88b90ef41d3638c1baf28e1804270adeda9bea2e0bdd713b8cc00655aeac24ef
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 16864 bytes
SHA-256: 6eaaf7079f93f7fa69d2a35f6c6bcfb17a43eae44bd0c728c89d222b49a95bf2

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