Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aec787829abc48…

MALICIOUS

PDF

93.1 KB Created: 2021-06-14 04:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2893c96a00bb6d9c309bf288e583d097 SHA-1: 41c9adce128fb32aa5051524ef36bc7db8cc68e3 SHA-256: 50aec787829abc48b744fcbd61ffb2d5edc7bdb036f253717d786b6df97af25d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains text related to a 'Palm desert high school campus map', which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=palm+desert+high+school+campus+map PDF link annotation
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b23febea7---somiwakofoxizuberesax.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16092507dd4ae9---pexewunugatilisakufi.pdfIn PDF document text
    • https://werbemittelag.chupload/file/49565049918.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbcb9af2fb---16197773285.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb2453f55.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/96338367789.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6366c034---bijasejitobabekuzuri.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/76552226972.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/desogopisaxifojedum.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/74509570627.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e27c5bc5417df0d5f5917001479e8ff7/muvuwojegiworukimamil.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/54776977436.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607491c724daa---68283595913.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a54e2c9ebf34e5487332ece10139457b/nitub.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ceb5b75fa---kifewepufoposonimu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ug3ukfnlccpmhudtsksi0nkbeh/kezibu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/75cf88e61d3d0b2e1f0f125f7a4370a8/59328853354.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/xovimezotuferesebozijexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 5488 bytes
SHA-256: 88e5a7a7426c7362481e456dab1d78fba380e77b737e7c39822e880780f5e06a
font_01_sfnt_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 12096 bytes
SHA-256: 42e23b72c6133207d423ff761225209394874b494fd5f9f8d617dcce252c57c3