Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53a876b90f73fd9…

MALICIOUS

PDF

71.6 KB Created: 2021-09-04 15:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 878376877d04c173b44639dd915a66a1 SHA-1: 02acbe11f9d553d1e19530cacf3e728361c92f47 SHA-256: b53a876b90f73fd9aa22ac2174356f55207a484c7c59a557e8931adf03b5a3f7
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's purpose is to trick the user into installing or engaging with remote support software. The numerous embedded URLs, many pointing to compromised WordPress sites, likely serve to host or redirect to malicious payloads or phishing pages. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://krisoc.ru/uplcv?utm_term=barcode+scanner+online+pdf PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d08ce608361bb933015b4dfdf4795b7a/vivewejezovaxiwekula.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/22036467426.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/jozutegefapozex.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d82a56hnspli9fmpdpruidsp55/xazuriwikekijavuwima.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b896f601703---xodurebomuriputiwokudur.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93180895733.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-29/images/files/kadiruku.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989714cbf6b---tilera.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608362914adae---94321255672.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/36016920853.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd6676f4c---47199778593.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/fomaxipuwemarojeg.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/kelubonebe.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/leaic2kv50aiv5jmsu2tkqteqo/15310888017.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608587a5382fe---fazokokamujonivutaforuja.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c7f1aa09cbfef1e3909c7a21df6e51a6/83525546831.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lefagojatifosafu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/febe8bdee4ff6b5ff2e07ae408f5cde9/nanedebew.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/lagij.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/melefigimomaxomipelokogo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75cfdc719---tebojimoguju.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/murisotonofazofumemudif.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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 16228 bytes
SHA-256: 4d758a271a75d7cabe0f04927d760830c85782e075ccea3d59535abbf0fcf126
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 10568 bytes
SHA-256: ae56b87eaf3b3618e06a80db3dd9efc940223c734bfcbfe2857aafe2fef45324

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