Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfef0a75203b1776…

MALICIOUS

PDF

90.0 KB Created: 2021-08-01 08:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a164f72d09134a21bdcbe9c40cfc9fac SHA-1: 4555b43b9ed150424cdd626ec35939fb1cf73c65 SHA-256: bfef0a75203b17768ebf2bfc4340dc568b32eaccf6b65326db6fc4112c8190c2
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f1ef0d723005146ff1491ddb7c5e875e/mopulibojabej.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qugi8t11ijggil76a1qskac8rk/41827682931.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/48bc6e574f4d1d1287ce8b84a279a779/20263224733.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/mukoronerorekubefak.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d111e0f7f6---4055670520.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052604440219.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1964eecc---wiwurijosovawubuj.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1622984690.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/semivanomusaf.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107260327177329.pdfIn PDF document text
    • http://bestcareloan.com/ckupload/files/94742361173.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9a30fccef3df71b2b40ee5e57ffee9e1/94502219989.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3141cf816---dejekulawu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///64546695687.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sjhp1fofac8fr0qmrf60r322f0/58002831465.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e7cb4f93fa039f3fe876aba2fe294fa0/32016604419.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b1116514ab8---81500328413.pdfIn PDF document text
    • http://pnalog.ru/images/file/gezexezoliziwavuteveni.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/53638391540.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80af59c9e---keses.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501191712.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ep3nob0hstg1ru35m07ivg29nl/renoseb.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7fefb49d3b9240f8024e1b71db3381f1/24668572438.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/sasizetimidagupij.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/miwopidakaveramiko.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kogupujozijed.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f0695862eb68055772c2b22ad17f627c/29488164393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=despacito+dj+remix+mp3+song+free+downloadPDF 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_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 18616 bytes
SHA-256: 0fa1ed3846a52a916514186df4169b9949bcc1cf70e42b262a62c485b65aa19b
font_01_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 11456 bytes
SHA-256: 30123b94888d7f07f5ad1c37a6ecd8f0600257177e254f2d0d688265ee765bde

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