Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b0e8003c9a355…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89eed12b04ac264de5cddb54a2aa6657 SHA-1: 119e1b0fe93d36e174f6e6a97a4714486a0a9584 SHA-256: 440b0e8003c9a3559ac5dd419057b17f6b847675264ce82ef8df79f7655aae51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised websites, that likely lead to further malicious content or exploits. The presence of a 'download' button lure reinforces the deceptive nature of the document, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=proteus+isis+7+professional+tutorial+pdf PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mgmdsaq1ch8dk9lhek0hpdnqcc/wafunonebumegelifadibemex.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2392fafe7b---didifudajakoko.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/vimudotujozopegafelofigeg.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212a799ba4---kisekuvodasukibajizofo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502122530804674.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/74390158542.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6d0m73g2967mfgmvchdmdodo3/25338214519.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cabab857bc1fc9c5c8147c61362a1f7/51260878763.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/95631284205.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/81516390448.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/79vmia49aaue4q42hif2vnfdv7/55520069384.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/46437351097.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071929bd76b2---82860843032.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/zifizepabadegokenem.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef2c0dea5f3fc2344dc2d4d6d8e18d58/lasad.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gowaxuwadojozitexogudike.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160873fc4b5475---20046535486.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/240104238946.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pibititogagoxat.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b4f613c48---wozorixawoxuvufomelez.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lusiwebejokedowajilodeki.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610892eb16f41---kogigure.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/bibexonetek.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c9d9bd52d0fdc2f1a37b25727ab4e78/13186296429.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10640 bytes
SHA-256: 2ec9665b6c10f81cb0c8357345dad40578845293c95accfc1ac6aa9693b8c7c5
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 18268 bytes
SHA-256: bedb32036360f027aa313f23d7b9ddc7c50bab466fd2caa149573bae93bd50b9
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1