Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3ebc80be95c06b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 09:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cfb07a0d63b20cdc6426d3e3df295df SHA-1: cf689c7625b01d836cf45c8a4eecbd3bfe7ddea2 SHA-256: ef3ebc80be95c06b6c9f410529d843e7e4a3e38adce553c7e6eba3495c65c255
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised or potentially malicious websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://electrogalicia.com/electrogalicia/recursos/archivos/94310045425.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusiridugurazilaxek.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210914083244_513049282.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/nulapibapo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74dcec16f---kijowovevubifarijiwafo.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/1732852328.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/16827569766.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3c625bccb32c81c3c0c7cdd48b63cdaa/nemifoponuxisajabaruku.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/85325684787.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/61356705877.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/10634639317.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/rusisuganag.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/munemipisesulikese.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/17173544966.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/43040405646.pdfIn PDF document text
    • https://sambelteri.com/contents/files/biwobopepuzalo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b38cf82a260046debefb7f01b628dc5d/67302112875.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/majunuzilonemowoxuxibis.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/60018448826.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2b672faa9d3631946fd3170f2ca1cccf/kozimirofoweb.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/35152098689.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/22998119258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+vs+ios+pros+and+consPDF 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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 18764 bytes
SHA-256: f27d8d5504848f3fa34afe32fc95a0e5d0b5b3acc4c2d20a189f11aec6643301
font_01_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 10276 bytes
SHA-256: dcf1f1663643b5509fd74b643ed3154805b1fb4e0d09ea3cdbb6806ef15b14e8