Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bacb0eb2f8905d…

MALICIOUS

PDF

104.0 KB Created: 2021-06-29 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d56c6778f6a8755d963b2620737cb72f SHA-1: c9995059ef2a6a3a4c88bac02d6c80545ae1083a SHA-256: 45bacb0eb2f8905d4d50b81160d7f9818455e7c5bb4e671e97f16d522740a2c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, including WordPress uploads, suggesting an attempt to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the nature of the link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://huntic.ru/uplcv?utm_term=class+7+maths+exponents+and+powers PDF link annotation
    • http://hit-air.pro/ckfinder/userfiles/files/99040175501.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbb155810---bobojakesiwimejebepab.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vowazipixamigof.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1239cdee98---zonopuwug.pdfIn PDF document text
    • http://dzbnf.com/upload/file///8154180134.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/wotelotijawupukixoveb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079257847b32---21008180352.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/juvuz.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/i1cirnb1e65gl00v3ncfa05mc0/31730996614.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77451393252.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b8e6a0d3---dewixenamijutukotisutulu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/36d626567aa69bc344483672513888ef/35147361126.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/xewojozogukawipa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/04e1693ce26b026e90e782870e79b017/tixotufofarubexanumogawi.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kemerafobakikared.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/93336734009.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ad36d3ac245a85d33af9499c9fe57cac/363941093.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7077c7a95638e900c8bdbb54c6b13bc6/ruputaserumafaperukitaw.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/25325885868.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/81510463692.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zubugobixunakodukuwibiz.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/19277624001.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077974e3fb49---78708445721.pdfIn PDF document text
    • 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
font_00_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 10836 bytes
SHA-256: 0d1c15efdca9d3341d4b9a28cc8c7931248e9d03bf0d30b8bddbb96158c24f06
font_03_sfnt_off000160e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E9 18492 bytes
SHA-256: 03189cad786b62f2c4cced5463cb59b35a161e21206bae7a24d30290a37c03ca

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