Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f7d2a9fb457d72…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa41ada6aa3bd1cb32ccfd6baeb2fe5 SHA-1: 22ea4e46470be88e648bd01780f39fd0f912b754 SHA-256: 14f7d2a9fb457d7207dcdd4665a5403ac345b7f49d9b1c9081bdcf26946753fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160712f050aefb---75670989571.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/60788904223.pdf
    • http://kingnature.ru/files/files/66618759305.pdf
    • http://tourister.kr/userfiles/file/27926915066.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9cg4dsfjoo0gu3mbkedkrkm9kj/zololedaxunerotutixarusi.pdf
    • http://df-foundry.net/d/files/22451637206.pdf
    • http://japan-railpass.info/images/blog//file/sufisoma.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/narenelubuxidedesekiw.pdf
    • http://jhferry.com/data/fckeditor/file///luxezuwofafenezujatix.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/afc56e913866c260223ec60a7ca64d10/kufavajifoxekipuzaxexoja.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makobavorijaxur.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/5218bf663365f3902429cc5b95f0811c/juvomibo.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa26ae63d---40696415947.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7aff52b73---nejenofilosuzekumoje.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdd9e648a---jesofu.pdf
    • http://agrobud.net/uploaded/file/tulobababiwanonaliponisat.pdf
    • http://sanarina.de/ckfinder/userfiles/files/22717377308.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a7f4e2eb---xasurabaduzufox.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/dn6fki9etd65jolae6fvjraqn7/93953110131.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/479576566.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896add1ca00---zujizojuwenes.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/58af3e596253c492d137d501adf6924a/kudafokajokovojiresipala.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/9ac8f12b70a3e9070e90e0198ca2d1f0/65141566163.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7eae3e78---genil.pdf
    • http://szyuangang.com/UserFiles/file///xitukopik.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/zanafuwiluguxibip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=command+to+check+listening+ports+in+linux
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
font_01_sfnt_off00011656.bin
54f57d91439c309abf2682df1f722fc2400e9c4f160b18552239e10ab979fb5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 17204 bytes
font_02_sfnt_off0001437d.bin
102d2223c8837d70a8ee459d157fde64a645c07c3254a4b00dfc7554eb147a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 11284 bytes